Haradrim Rider

Mutate {2}{r} (If you cast this spell for its mutate
cost, put it over or under target non-Human creature
you own. They mutate into the creature on top plus all abilities from under it.)
First strike (This creature deals combat damage
before creatures without first strike.)
Whenever this creature mutates, put a +1/+1
counter on it. If it has a +1/+1 counter on it, this creature can't block.