Potent Citadel ReservoirBolas's Citadel Buy + Aetherflux Reservoir Buy + Necropotence Buy
Bolas's Citadel is already really easy to abuse with the Reservoir, but you usually stop after hitting a land. With Necropotence, you can exile that land for only 1 life and continue chaining spells.
If you don't win with casting your whole deck, you will almost certainly hit 50 life for the Reservoir at least once.
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