Heroism
Enchantment
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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イラスト：
Fallen Empires#6アンコモン英語適正
裁定
2004年10月4日
The cost to avoid the penalty must be paid when the ability resolves. You can’t wait until later to do so.
2004年10月4日
Paying 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.