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They mutate into the creature on top plus all abilities from under it.) Whenever this creature mutates, other creatures you control get +X/+X until end of turn, where X is the number of times this creature has mutated

This could be anything, ranging from putting a +1/+1 counter on a creature, exiling cards off the top of your library, or even playing a permanent for free

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This is a very convoluted strategy, though, and is very difficult to pull off

In the incredibly rare case where there is no legal target for the first or second mode, those modes can't be chosen at random