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354. Pay the card's costs.

354.2. See rule 360. Passive Abilities for more information.

354.2.a. Costs that are replaced with other events by replacement effects are still considered paid. Example: A player plays Cruel Patron, which says "As an additional cost to play me, kill a friendly unit." They also control Zhonya’s Hourglass, which says “If a friendly unit would die, kill this instead. Heal that unit, exhaust it, and recall it.” They choose to kill a friendly unit during rule

354.1. In total, pay the combined Energy cost (if any) and Power cost (if any).

354.1.a. During this step, the spell's controller can use activated abilities with the Reaction tag that Add resources to add Energy and Power to pay the spell's costs. See rule 161. Rune Pools and rule

354.3. A player may not pay costs during this step that will deterministically result in illegal choices or actions later in this process unless they have no choice. Example: A player plays Cruel Patron, which says "As an additional cost to play me, kill a friendly unit." They control multiple units, one of which is alone at a battlefield. During rule

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