Assertion: ability's effect | /r/CapableOf | ask for a mana payment
Facets:
Source sentences:
text: A player may activate an activated mana ability whenever they have priority, whenever they are casting a spell or activating an ability that requires a mana payment, or whenever a rule or effect asks for a mana payment, even if it’s in the middle of casting or resolving a spell or activating or resolving an ability.