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Pray — Once during each of your turns, you may cast a creature spell from among cards in your graveyard that were put there from anywhere other than the battlefield this turn.
Whenever you attack, you may pay 
and discard a card. If you do, draw a card.
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.
