Gray Fullbuster, Slayer

Vigilance, Double Strike, Ward {3}, Protection
from Demons.
{x}{x}{s}{b}: Deal X damage to any target,
times two, if that target was a creature, tap that creature.
{s}{s}{s}{b}: Exile target creature demon, its controller loses life equal to that creatures
converted mana cost.
Escape-{u}{u}{b}{b}, Exile 3 other cards
from your graveyard.