Colonel McCullough

{t},{b}{b}: Sacrifice a creature you control
with a -1/-1 counter on it. Draw two cards.
{t},{r}{r}{r}: Sacrifice an artifact you control. Destroy target creature an opponent controls.
Artifacts and human creatures cost {1} less for you to cast.

“All of human history has led to this. The irony is
we created you. And nature has been punishing us ever since.”