杀戮争战

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Rulings:

• 7/15/2007 If you don’t have twenty or more creature cards in your graveyard by the time your upkeep starts, the ability won’t trigger that turn.
• 7/15/2007 Mortal Combat’s ability has an “intervening ‘if’ clause,” so the condition is checked again when the triggered ability resolves. If you don’t still have twenty creature cards in your graveyard, the ability does nothing.