Kailari Vigilant

Lifelink, Trample
As long as you have 10 more life than your starting life total, Kailari Vigilant gets +4/+0 and has "Whenever this creature blocks or becomes blocked, exile the blocked or blocking creature. You lose life equal to that creatures power.
As long as you have 10 or less life Kailari gets deathtouch and steadfast.