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Whenever Fire Lord Ozai attacks, you may sacrifice another creature. If you do, add an amount of 
equal to the sacrificed creature's power. Until end of combat, you don't lose this mana as steps end.
: Exile the top card of each opponent's library. Until end of turn, you may play one of those cards without paying its mana cost.
Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.
