Platinum Angel + Magus of the Mirror + Cavern Harpy

Platinum Angel

Magus of the Mirror

Cavern Harpy

How it works

1. During your upkeep, activate Cavern Harpy by paying 1 life.
2. Repeat step 1 until you have zero life.
3. Resolve the last Cavern Harpy trigger, returning it to your hand.
4. The remaining Cavern Harpy triggers fizzle.
5. Activate Magus of the Mirror by tapping and sacrificing it, exchanging your life total with an opponent.
6. The opponent loses the game due to having zero life.

This gruesome life-swap loop relies on Platinum Angel's static ability to completely ignore the danger of bleeding out. You begin by repeatedly activating Cavern Harpy, spending 1 life over and over to bounce it back to your hand until your life total hits zero. With your survival safely guaranteed by the Angel, you then tap and sacrifice Magus of the Mirror during your upkeep to exchange your desolate life total with an opponent, instantly plunging them into negative life and forcing them to lose the game.