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Just tweaking a deck I already have. Trying to keep it cheap. Suggestions greatly appreciated
Try and get chronic flooding as quick as possible, then try to get the mind sculpt-duskmantle guildmage combo to dock some life, or get consuming aberration out. Also use stolen identity to replicate consuming aberration for even more mill.
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http://www.mtgvault.com/slivermania/decks/persecution-by-sliver/
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Traumatize and Undercity Plague could be two cards to look into. Considering you have Deathcult Rogue, which is basically unblockable, you'd have a way to keep your opponent's offense to a minimum with Undercity Plague.