Theran, The Mighty Beast

Haste, menace, trample, vigilance, rampage 1
Deathtouch, lifelink, reach
Enrage — Whenever this creature is dealt damage
it gets +X/+0 until end of turn and deals 1
damage to up to X target planeswalkers or
creatures where X is the damage it was dealt.
This creature cannot be countered or exiled and
it has Hexproof as long as it's tapped.