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DevoidDevoidThis card has no color. (This card has no color.)
When you cast this spell, exile up to one target noncreature, nonland permanent an opponent controls 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. 4 or less. If you do, Thief of Existence gains "When this creature leaves the battlefield, target opponent draws a card."
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.
