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Disrupt your opponent with discard while you find Doomsday and the right cards to form a win via Tendrils of Agony or Laboratory Maniac.
As this is an extremely budget version of a proper Doomsday deck, it has a lot less power and flexibility, and is intended for a casual duel against other (strong) casual decks.
Rough pile ideas:
"The Seven Mana" --- requires ability to make seven mana while casting 3 spells, and doomsday and a ponder/preordain in hand --- cast 3 spells, cast dd, make pile: "draw4/mana/mana/mana/tendrils", cast ponder/preordain and draw into pile
"The Six Mana" --- requires ability to make 6 mana while casting 3 spells, dd and probe in hand -- cast 3 spells, cast dd, make pile "draw4/mana/mana/mana/tendrils", cast probe and draw into pile
"Laboratory Maniac" --- for when you're short on storm, or the opponent has too much life to tendrils him to death. Requires 7 mana, dd and probe in hand --- cast dd, make pile "draw4/mana/mana/labman/probe"
"The Pass the Turn" --- for when you're short on storm and mana, requires ability to cast dd this turn and also make 4 mana next turn --- make pile "draw4/mana/mana/labman/probe", draw the draw4 at beginning of turn, cast everything gg
Note that having cards in hand that would otherwise need to be added to the doomsday pile effectively increases your available mana, as you can replace their slot in the pile with a ritual or a lotus.
Putting discard into the pile is very helpful if you have extra mana to work with, it prevents counterspells on your tendrils and bolts on your labman.
changes: -1 ill-gotten gains, -1 chain of vapor, -1 duress, +2 ponder, +1 lim-dul's vault
maybe: substitute tendrils with
Chromatic Sphere
for multiplayer, as ability is a mana ability, so you drop labman with sphere on-board, and can draw a card without using the stack so you can win before your labman can get doombladed, with no way for opponents to respond
