
Whenever a nontoken creature you control diesdiesA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying., reveal cards from the top of your library until you reveal a creature card. If its mana valuemana valueThe total amount of mana in a card's cost, ignoring colour. A card costing has mana value 4. X counts as 0 except on the stack. is less than or equal to the number of lands you control, put it onto the battlefield. Otherwise, put it into your hand. Put the rest on the bottom of your library in a random order. This ability triggers only once each turn.
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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.