Heroism #6
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Card Details
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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Illustrated by Mark Poole
Rulings (2)
Oct 4, 2004
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.
Oct 4, 2004
The cost to avoid the penalty must be paid when the ability resolves. You can't wait until later to do so.