Karaknul Kultists

Blood Sacrifice: {t}, sacrifice creature you control. Karaknul Kultists gain +X/+Y, where X is half the Power and Y is half the Toughness of the sacrificed creature, rounding up.
Devour Courage: After Karaknul Kultists battle a creature, place a -1/-1 counter on the creature they battled and a +1/+1 counter on Karaknul Kultists
at end of turn.