Doom Slayer

Haste, Protection from Demons.
{w}{b}{r}, {t}: Doom Slayer fights target creature.
If that creature is a demon, it gets -2/-2 until end
of turn.
Whenever a demon that has been dealt damage
by Doom Slayer this turn dies, you may have
Doom Slayer gain Indestructible, vigilance, first strike, menace, lifelink, or deathtouch until this ability is used again.