The Gitrog Monster is a fine value engine. But to really harness its draw ability, you want a land you can discard over and over. You want Dakmor Salvage.
With the Monster in play and Skirge Familiar as a sac outlet, you can discard and dredge Dakmor Salvage again and again, milling your whole deck. Thanks to Gaea's Blessing, Dread and Vigor, you'll never run out of cards in your library. Meanwhile Skirge Familiar will create an endless supply of black mana.
Once you have unlimited mana, Syphon Life, Dakmor Salvage and The Gitrog Monster let you drain all of your opponents out. If you can't find Syphon Life, Worm Harvest can end the game with unlimited Worm tokens.
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