Darien, King of Kjeldor + Sanguinary Priest + Vibrating Sphere

Darien, King of Kjeldor

Sanguinary Priest

Vibrating Sphere

How it works

1. During an opponent's turn, cause the additional creature to die.
2. Sanguinary Priest triggers, dealing 1 damage to you and causing you to gain one life.
3. Darien triggers, creating a 1/1 Soldier creature token.
4. The Soldier enters the battlefield as a 0/-1 due to Vibrating Sphere and dies as a state-based action due to having zero toughness.
5. Repeat from step 2.