Pixie, Mistress of Mutation

Pixie, Mistress of Mutation counts as all creature
types
Mutate: {3}{g}{u}
All Creatures you control have Mutate, their
mutate cost is equal to their converted mana cost.
Every time a creature you control mutates, put a
+1/+1 counter on Pixie. Pixie has all abilities of creatures
that have mutated