Gideon of the Trials + Magus of the Mirror + Necropotence

Gideon of the Trials

Magus of the Mirror

Necropotence

How it works

1. During your upkeep, activate Necropotence by paying 1 life, exiling the top card of your library face down.
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.