Elize, Sanguinary Insurgent

Bloodthirst 2 (If an opponent was dealt damage this
turn, this creature enters the battlefield with two +1/+1 counters on it.)
Lifelink, trample
Whenever you cast a non-Vampire creature spell,
it becomes a Vampire in addition to its other
types and gains bloodthirst X, where X is the
damage dealt to your opponents this turn.