Strong discard and removal effects help me keep control of the game while I restock myself with Necropotence and Yawgmoth's Bargain. If I haven't been able to close out the game with my creatures, I can go straight to the opponent's head with Corrupt and Drain Life (I know Consume Spirit is strictly better, I just have a special place in my heart for Drain Life). Doomsday is there to set up a library of 4x Corrupt + Doomsday that's almost always an inevitable win, even against multiple people.
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