Nemesis, Raging Mutation

Menace, Double Strike, Trample

For each Nemesis, Stalking B.O.W. and Nemesis, Mutated Horror in the graveyard, Nemesis, Raging Mutation gets +1/+1
Each time Nemesis, Raging Mutation is blocked,
and isn't destroyed, add 1 Mutation counter
{b}{r} — Remove 1 Mutation counter, add a +1/+1
counter to Nemesis, Raging Mutation