Artorias the Abysswalker

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

One of the four knights of Gwyn. Unbending will and hatred for the abyss led him to darkness.