Strongest Grappler

Vigilant, fight, regenerate {g} + from death {b}.
If Strongest Grappler is exiled, mind controlled, or disabled: it ends after 4 turns; return to hand.
Born To Fight {g}{r/g} — Survive a fight or combat with another creature if Grappler's Toughness before damage is equal to or greater than creature's Power.
Stronger - Benefiting from Born To Fight permanently adds +1/+1 up to 7/7.
Demon Back {b/g}{g/w}{r/g} — If Stronger is adding +4/+4, for 2 turns gain +