Soul Echo + Magus of the Mirror + Wall of Blood

Soul Echo

Magus of the Mirror

Wall of Blood

How it works

1. During your upkeep, activate Wall of Blood by paying 1 life, giving Wall of Blood +1/+1 until end of turn.
2. Repeat step 1 until you have zero life.
3. Activate Magus of the Mirror by tapping and sacrificing it, exchanging your life total with an opponent.
4. The opponent loses the game due to having zero life.