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, 
: Choose target non-Wall creature the active player has controlled continuously since the beginning of the turn. That player may pay 
, where X is that creature's 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.. If they don't pay, the creature attacks this turn if able, and at the beginning of the next end step, destroy it if it didn't attack this turn. Activate only before attackers are declared.
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.
