I agree with DJK that Mutate is not a good keyword. Probably the closest you could come is copy effects. I could perhaps see putting an ability like this on one creature, at high rarity, with high cost - but then again, perhaps not. If you want to do something like Cairn Wanderer and Soulflayer, maybe...
Cost: Mutate (this creature becomes a copy of target creature you control until end of turn, except its power and toughness are unchanged)
Although there's no way any card with that mechanic could sit below rare. (Note that both the cards you cited are rares.)
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Cost: Mutate (this creature becomes a copy of target creature you control until end of turn, except its power and toughness are unchanged)
Although there's no way any card with that mechanic could sit below rare. (Note that both the cards you cited are rares.)