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I was reminiscing over a game with a similar build to this. Turn one I paid two life, gitaxian probed the opponent, then followed up with a cabal therapy hitting two cursecatchers. The next turn I dropped a hellspark elemental, swung for 3, then sacrificed it at the second main phase to flashback cabal therapy, hitting the opponents lord of atlantis. I liked the synergy so much I believed it deserved time for a proper build.
The key is to disrupt early on giving you an advantage. Dark confident keeps the pressure on while you whittle away their life points and render them completely defenseless. Disrupt their hand with thoughtseize and cabal therapy; burn either their early-game blockers with lightning bolt and chain lightning or send it over the top to their life points. I chose to include chains of vapor in the sideboard should they run Leylin of Sanctity, which would completely shut down the deck.
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