Murah, Apex of Kinship

Mutate {1}{g/u}{w}{w} (If you cast this spell for its mutate cost, put it over or under target non-human creature you own. They mutate into the creature on top plus all abilities from under it.)
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Whenever this creature mutates, choose one —
• Each player draws a card.
• Each player gains 1 life for each card in their hand.