Eternity Vessel + Darksteel Reactor + Donatello, Mutant Mechanic

Eternity Vessel

Darksteel Reactor

Donatello, Mutant Mechanic

How it works

1. Cast Eternity Vessel by paying 6. It will enter with a number of charge counters on it equal to your life total.
2. Cause Eternity Vessel to leave the battlefield. When it does, Donatello triggers, putting a number of charge counters on Darksteel Reactor equal to the number Eternity Vessel had on it.
3. Darksteel Reactor triggers, causing you to win the game.