The Engineer

Pay {u/r}, {t}: Deal 1 damage to target creature that entered the battlefield under target opponent's control this turn.
Pay {u/r}{u/r}, {t}:Deal 2 damage to target creature that entered the battlefield under target opponent's control this turn.
Pay{u/r}{u/r}{u/r}, {t}: Deal 2 damage to target creature that entered the battlefield under target opponent's control this turn. Deal 1 damage to target opponent.

"If that don't work...use more gun."