Heroism
Enchantment
Oracle Text
Sacrifice a white creature: For each attacking red creature, prevent all combat damage that would be dealt by that creature this turn unless its controller pays
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Rulings (2)
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Wizards of the CoastThe cost to avoid the penalty must be paid when the ability resolves. You can’t wait until later to do so.
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Wizards of the CoastPaying the Heroism cost to allow a creature to deal damage does not prevent other effects from preventing it from dealing damage. Paying the cost only prevents the Heroism effect.