
When Ol' Buzzbark enters, roll X six-sided dice onto the battlefield from a height of at least X inches. For each diedieA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying., put a number of +1/+1 counters equal to the result on each creature you control that diedieA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying. is touching. For each diedieA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying., Ol' Buzzbark deals damage equal to the result to each creature an opponent controls that diedieA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying. is touching.
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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.