A 5/5 for four colorless is above rate, but an opponent removing metalcraft also functionally removes this card
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In the late game, Kumena can keep your amphibious army loaded up with +1/+1 counters
However, outside of flavour, these cards are very different to battles
The payoff of becoming a creature that gives all your stuff flying is pretty great too, even if its susceptible to removal
As a result, WotC have made the decision to restrict this ban to MTG Arena's best-of-one format only, and not any best-of-three or paper play