Soul Echo + Soul Conduit + Wall of Blood

Soul Echo

Soul Conduit

Wall of Blood

How it works

1. 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 Soul Conduit by paying 6 and tapping it, exchanging your life total with an opponent's.
4. The opponent loses the game due to having zero life.
5. You may repeat this on each of your turns.