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When Dr. McCoy enters, put a +1/+1 counter on another target creature you control.
If another creature you control with a +1/+1 counter on it would be destroyed, instead remove all +1/+1 counters from it and all damage already dealt to it is healed.
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.
