Fenix, the Fox Mimic

Double strike, vigilance, reach, lifelink
Mutate {3}{w}{r} (If you cast this spell for its mutate
cost, put it over or under target non-Human creature
you control. They mutate into the creature on top plus
all abilities from under it.)
It stalks the mountains, leaping from peak to peak,
and giving aid to those who need it, and death to those
who don't. None who go after him ever return.