CR / RELEASE 2026-07-24Rule 444.2.aIf the instruction to Pay resources is part of paying costs for a card or ability, choosing not to pay those resources will cause the act of playing the card or ability to be undone. See rule 358. Check Legality for more information.Rule hierarchyParent444.2When a player is instructed to Pay a resource, that player may remove that resource from their Rune Pool if it exists there. If they choose not to, the instruction is ignored. Example: When Diana, Lunari’s triggered ability resolves, if its controller has [1] Energy in their rune pool, they choose whether or not to pay that Energy as instructed. If they choose not to pay the Energy, they will not perform the additional effects of the triggered ability.