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Whenever this creature attacks, you may pay 
and discard a card. If you do, this creature deals damage to target creature or planeswalker equal to the discarded card'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..
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.
