Enchantment, 2W (3)
Uncommon (U3)
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 {2}{R}.
Illus. Mark Poole

10/4/2004: The cost to avoid the penalty must be paid when the spell resolves. You can't wait until later to do so.
10/4/2004: 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.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Commander