When a Replacement Effect applies, it replaces the qualifying event with one or more Game Actions or events, or the qualifying instruction with another instruction. 1. In the case of Replacement Effects that describe a game action to occur “as” an event occurs, the described event is replaced by that same event plus the game action being performed. Example: Undertitan is a unit that reads in part “As I’m revealed from your deck, [Add] [2].” The event of Undertitan being revealed from your deck is replaced by Undertitan being revealed from your deck and adding [2] Energy to your Rune Pool.
§ 370.1.b Core Rules PDF (officieel)
§ 370 A Replacement Effect can alter the typical flow of play, including other cards' executions.
§ 370.1 Replacement Effects apply to any event or instruction that qualifies for their application. A Replacement Effect will specify the circumstances by which an event or instruction will qualify to be replaced.
