Mervis the Undefinable

Mutate {g/u}{g/w}{r/w}{u/r}
Whenever this creature mutates, target creature becomes a copy of this creature, then create
a copy of that creature and return this creature
to it's owner's hand.
When this creature would enter the battlefield, instead create a non-legendary copy of this creature
that enters with 2 counters at random from among
deathtouch, menace, vigilance, first strike, reach, +1/+1, trample, flying, indestructible and defender
and return Mervis to it's owner's hand.