The Mean One

Partner (When this creature enters the battlefield, target player may put Max, The Loyal Steed in their hand from their library, then shuffle)
Menace, Vigilance

{1}:Steal (Choose an opponent to steal from. You may only choose an opponent you dealt damage to this turn.

Grow: On your upkeep you may pay 1 life. If you do not, you place 1 grow counter on The Mean One (your heart grows one size). When you have 5 grow counters, exile The Mean One.