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Rulings
If you control no creatures as Repulsive Mutation is resolving, the amount of mana the target spell’s controller must pay to stop their spell from being countered is 0. That player can choose not to pay 0 mana; if they do, the spell will be countered.
Rulings
If you control no creatures as Repulsive Mutation is resolving, the amount of mana the target spell’s controller must pay to stop their spell from being countered is 0. That player can choose not to pay 0 mana; if they do, the spell will be countered.
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