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Destroy target creature with 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. X. If that creature diesdiesA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying. this way, Kaervek's Purge deals damage equal to the creature's power to the creature's controller.
Hover an underlined rule to see what it means.
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.
