Big Mek

Shokk Attack Gun - During your attack phase you may sacrifice a creature, if you do Big Mek gains +X/+0 until the end of the turn where X is the sacrificed creature's power.
The shokk attack gun opens a tunnel through the warp into its target, then launches screaming Snotlings down it. The diminutive greenskins rematerialize as a terror-maddened, clawing, biting swarm.