Altaïr, Grand Master

Vigilance, haste
Altaïr, Grand Master gets +1/+1 for each experience counter you have.
{t}: Altaïr, Grand Master deals 1 damage to target creature you don’t control. When that creature dies
this turn, you get an experience counter.

“Our Creed does not command us to be free. It
commands us to be wise.” — Altaïr Ibn-La'Ahad