Devouring Hellion | Creature | Hellion | As Devouring Hellion enters the battlefield, you may sacrifice any number of creatures and/or planeswalkers. If you do, it enters with twice that many +1/+1 counters on it. | Bayard Wu
2.0 LSV
Mayhem Devil | Creature | Devil | Whenever a player sacrifices a permanent, Mayhem Devil deals 1 damage to any target. | Dmitry Burmak
1.5/3.5 LSV
Rubblebelt Rioters | Creature | Human Berserker | Haste
Whenever Rubblebelt Rioters attacks, it gets +X/+0 until end of turn, where X is the greatest power among creatures you control. | Tomasz Jedruszek
3.0 LSV