Seghulerak, Vanguard of Chaos

Cowards can't block Snakes
Whenever a creature blocks or is blocked by Seghulerak, Vanguard of Chaos, that creature becomes a Coward until Seghulerak leaves the battlefield unless that creature's controller pays {2}.
Thrall To Demon — Whenever Seghulerak attacks a player with a lower life total than
you, she gets +1/+0 until end of turn.