During this step, the card's controller can use activated abilities with the Reaction tag that Add resources to add Energy and Power to pay the card's costs. See rule 165. Rune Pools and rule 429. Add for more information.
§ 357.1.a Core Rules PDF (officieel)
§ 357 4. Pay the card's costs.
§ 357.1 In total, pay the combined Energy cost (if any) and Power cost (if any).
