Vytheg, Amalgam of Avarice

Mutate {2}{g}{u}{b}
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Non-Human creature spells you cast have
mutate. The mutate cost is equal to its mana cost.
Whenever a creature you control mutates, put
your choice of a +1/+1, deathtouch, hexproof,
menace, reach, siphon, or trample counter on
that creature X times, where X is the number of
times that creature has mutated.