Renekton, Butcher of Sands

Cull the Meek - Whenever Renekton attacks, you
may sacrifice a creature. If you do, deal damage equal to Renekton's power to a creature an opponent controls.

Dominus - Exhaust {2}{b/r}{b/r}: Put two +1/+1 counters and a lifelink counter on Renekton. When Renekton attacks this turn, he deals 2 damage to each creature opponent controls.