Geverifieerde rulings en officieel bevestigde community-inzichten, met per item de volledige bewijsketen: bron, citaat en klikbare §-verwijzingen.
Dragon Roost (§054.2., 369.3.)
When two mandatory positive requirements conflict on where to play a unit (e.g., Elder Dragon's AA instructing play to Dragon Roost and another effect specifying a different location), the player chooses one requirement and ignores all others. This only applies to mandatory positive requirements that specify a location or method without also preventing play elsewhere. Citaat uit de bron: “the player chooses one of those requirements and ignores all others”
Perched Grimwyrm (§054.2., 369.3.)
If Perched Grimwyrm cannot be legally finalized (no valid play location due to its own restriction), all actions taken as part of playing it are undone and it is returned to the zone it was played from. If you have conquered a different battlefield this turn you may play it there without paying Dragon Roost's additional cost, but not to Dragon Roost itself unless you've conquered it. Citaat uit de bron: “The actions taken as part of playing Perched Grimwyrm will be undone and it will be returned to the zone it was played from.”
golden-rules (§054.2., 369.3.)
In Riftbound, 'can't' beats 'can.' Perched Grimwyrm's restriction (can't be played except to a battlefield conquered this turn) is a prohibition that Dragon Roost's permission to play a dragon there cannot overcome. Citaat uit de bron: “In Riftbound, 'can't' beats 'can.'...Dragon Roost's ability tries to give the Grimwyrm permission to be played to the Roost, but that can't overcome Perched Grimwyrm's own restriction.”
Baron Nashor (§054.2., 369.3.)
Baron Nashor's passive generates a delayed replacement effect ('I enter there') that replaces his entering any other location with entering the Baron Pit, bypassing play-location restrictions such as Mageseeker Warden. Dragon Roost is only a permission on play location, not a replacement effect, and therefore cannot bypass such restrictions. Citaat uit de bron: “Baron Nashor's passive ability generates a delayed replacement effect...This replacement effect replaces the event of him entering to any other location with him entering to the Baron Pit.”
During the Beginning Phase, each player channels 2 Runes from the top of their Rune Deck; the second player channels 3 Runes on their very first turn to compensate for going second.
“If you're going second on your very first turn, you get 3 Runes instead to help catch up.”
A player's main deck may only contain cards belonging to the domains listed on their Champion Legend card.
“her deck must only contain cards of the Mind and Order domain”
“You can only put cards in your deck that match your Legend's Domains”
Ravenborn Tome's Bonus Damage effect now applies only to the next spell played 'this turn,' preventing the bonus from carrying forward to future turns.
“The next spell you play this turn deals 1 Bonus Damage.”
Gear cards enter play in the Ready state (not Exhausted), so they can be used immediately; Gear always enters at the controller's Base.
“Gear cannot hold or conquer battlefields, and can only exist in base. If a Gear card is played at a battlefield, it is immediately recalled to the base.”
“Gear enters play Ready, so you can use it right away. It always goes to your Base.”
Dragon Form
Dragon Form sets a unit's base Might to 5 via the Trait-Altering layer; existing arithmetic modifiers (e.g., Stupefy's -1) are applied in the Arithmetic layer. Layer evaluation is instantaneous—there is no window where the unit momentarily exists at 5 Might before the modifier is applied. A unit under both Dragon Form and Stupefy is immediately 4 Might; Fiora, Grand Duelist will not trigger. Citaat uit de bron: “this process happens instantaneously; there is no window while evaluating layers for the unit to see itself become 5 M and then go down to 4 M”
Signature Cards are Legend-specific cards that can only be included in a deck matching their designated Legend, with a maximum of 3 total Signature Cards permitted across the entire deck.
“You can only use them with their matching Legend, and you can't put more than 3 total Signature Cards in your deck.”
Counter Strike vs. Elder Dragon (§437.2.a)
If Counter Strike (or any prevent effect) completely prevents Elder Dragon's 1 damage to a unit, that damage is never dealt per rule 437.2.a. Since no damage is dealt, Elder Dragon's passive ability—which redefines lethal damage thresholds for units that have damage marked on them by its controller—has no opportunity to apply to that unit. Citaat uit de bron: “If the damage is entirely prevented, it is never dealt per rule 437.2.a., and thus there is no opportunity for the passive ability of Elder Dragon to apply”
Units with the Ganking ability may move directly from one Battlefield to another, whereas normal units can only move between their controller's Base and a Battlefield.
“only units with the Ganking ability may move between battlefields”
“Some units have Ganking though, which lets them move from Battlefield to Battlefield.”
Draven, Audacious
When Draven wins combat and conquers, his triggered ability resolves before you gain the regular point for scoring the battlefield and before any conquer effects trigger. Consequently, Draven's point is counted first—e.g., going from 6 to 7 points means the subsequent conquer gives a card draw instead of the 8th point. Citaat uit de bron: “Draven's ability will trigger and resolve before you gain your regular point for scoring the battlefield and before any conquer effects are triggered.”
Action Spells may be played during the controller's turn or during a Showdown; on an opponent's turn, a player may only play Action Spells during Showdowns.
“Most Spells are labeled Action, which means you can play them during your turn or during a Showdown. If it's not your turn, you can only play Action Spells during Showdowns.”
Elder Dragon (§460.2.c.3)
Elder Dragon's passive ('Any amount of your damage is enough to kill enemy units') alters the lethal damage threshold for units with damage marked by Elder Dragon's controller to any non-zero amount. As a result, Elder Dragon can check damage marked on units before it enters the board, and its controller need only assign one damage per unit during the Combat Damage step. Citaat uit de bron: “Elder Dragon can check damage marked on units by its controller before it enters the board, and that players need only assign one damage to units during the Combat Damage step while they control Elder”
Recalling a unit to base via Zhonya's Hourglass is explicitly not considered a move.
“Send it to base. This isn't a move.”
Astral Heron
Astral Heron's triggered ability discounts the next card played (added to the chain and queued for finalization) this turn after the ability resolves. Erratum wording: 'When you play your first card each turn, if I'm at a battlefield, the next card you play this turn costs [2]AA less.' Citaat uit de bron: “It discounts the next card played (added to the chain and queued for finalization) this turn after the ability resolves.”
When an Attacker destroys all Defending units and still has units remaining, they conquer the Battlefield and immediately score 1 point; additionally, every time a Battlefield is conquered without winning the game, the conquering player draws a card.
“every time you conquer a Battlefield but it doesn't win you the game, you get to draw a card”
errata policy
Errata may impact the effective power level of cards, but Riot has no plans to issue errata strictly for power level reasons — only to make cards work within the rules and as intended. Citaat uit de bron: “we have no plans to issue errata strictly for power level reasons—only to make cards work within the rules and as intended”
Each Battlefield can only award 1 point per turn; moving a unit away and replacing it with another unit in the same turn does not grant additional points.
“Moving away from a battlefield and back to it with another unit the same turn will not gain you a bonus point.”
“Each Battlefield only gives you 1 point per turn max. You can't move a unit away and move a new one in to score twice.”
Ravenbloom Student (§419.4)
Ravenbloom Student's triggered ability checks whether a spell you control resolves, not whether you finalized it. Gaining control of an opponent's already-finalized spell (e.g., via Rebuttal on Stupefy) still causes the ability to trigger when that spell resolves. Citaat uit de bron: “Ravenbloom Student's triggered ability checks whether a spell that you control resolves. You gained control of the Stupefy, and it resolved, so you will have triggered Ravenbloom Student's ability.”
Even when no enemy units are present during a Showdown, both players may still play Actions and Reactions in an attempt to remove the attacking units.
“Even if there are no enemy units, players may still play Actions and Reactions to try and remove the attacking units.”
play from deck (banish first)
Cards that instruct you to play a card from your Main Deck must first banish that card, then play it from banish. This gives the game a defined zone for the card while it is being played and a place to return it if it cannot be played for any reason. This applies to Rek'Sai Swarm Queen, Void Burrower, Void Rush, and Reinforce. Citaat uit de bron: “banishing the card ensures that the game has a place to put the card until it's actually played, and a place to send the card back to if it can't be played”
A unit's Might value represents both the damage it deals in combat and the total damage it can absorb before being destroyed.
“Might... this number shows how much damage they deal AND how much they can take”
Tianna Crownguard
Tianna Crownguard only prevents opponents from gaining points; she does not interfere with the process of conquering or holding battlefields. Opponents can still conquer and hold battlefields, receive conquer/hold triggers, and even draw a card if conquering a final point they cannot score. Citaat uit de bron: “Tianna is solely concerned with points and doesn't interfere with the process of conquering or holding battlefields.”
Accelerate
Accelerate creates a delayed replacement effect that causes the card to enter ready. This delayed replacement effect persists on the card even after the Accelerate keyword itself is no longer present when the card resolves. Citaat uit de bron: “Accelerate creates a delayed replacement effect that causes Atakhan to enter ready. Although he lacks the Accelerate keyword when he resolves, he still has the delayed replacement effect”
Flow
A spell played for its Flow cost is banished even if countered by Abandon. "Then banish it" means: if the flow spell would leave the chain after becoming a finalized chain item, and leaving the chain was not instructed by the spell's own execution, banish it instead. Abandon returning the spell to hand counts as such a departure, so the spell is banished rather than returned. This also applies to effects like Kai'Sa, Evolutionary and Fizz, Trickster. Citaat uit de bron: “No matter how it happens, as long as the flow spell leaving the chain wasn't instructed by the execution of the spell itself, it will be banished.”
Arise!
Arise! is revised to use a reflexive trigger: it first plays a 2 M Sand Soldier unit token for each Equipment you control, then 'Then do this:' readies up to two of them, allowing players to respond between the two effects. Citaat uit de bron: “Play a 2 M Sand Soldier unit token for each Equipment you control. Then do this: Ready up to two of them.”
Draven, Vanquisher
Draven, Vanquisher reads 'When I attack or defend, you may pay C. If you do, …' — because 'you may pay C' does not fall in the expected cost-within-instructions sequence position, the resource payment is not the base cost of the triggered ability. It is paid on resolution of the ability (not during finalization) and functions as a game action checked by 'if you do', not as a cost. Citaat uit de bron: “those resources are not a cost and are paid on resolution of the ability and not finalization.”
Legion (§419.4.b)
Legion checks whether cards were finalized by an opponent, not whether an opponent controls a spell that resolves. A spell finalized by an opponent but subsequently taken over via Rebuttal still counts as finalized by the opponent, so Legion abilities remain active. Citaat uit de bron: “Battering Ram and Legion … check whether cards were finalized. Although you gained control of Stupefy, you did not finalize it; you got it after it was already finalized by your opponent.”