Daedric Summon 4 - You may cast Dremora Caitiff Warrior for {B}{R} by paying 4 life in addition to it's other costs. If cast this way it enters the battlefield tapped.

When Dremora Caitiff Warrior attacks and is blocked, it deals 1 damage to target blocking player.

{3}{B}, Sacrifice another creature: Dremora Caitiff Warrior gets +2/+0 until end of turn.