Celestica

Flying, Trample, Hexproof, cannot receive more
than 7 damage per single source.(Max Health 35)
Concussive Roar: Whenever this creature attacks choose half the amount of target players
creatures, those creatures take 10 damage, the
other half have a 50% chance to damage
themselves when attacking or blocking for 4
turns. For 3 turns all damage dealt to this
creature is converted to health. Cooldown 5
turns.