With the new mulligan rules greatly improving combo decks' stability, I guess it's finally time to post this deck.

046ve066u30174a017810177v0177a017at057ee017qu027q9067qb0180b018pm
Golem -> Living Weapon -> Imbue targeting Boomstick in hand -> Golem (again) -> Momentum (if necessary) & Shard of Readiness -> Parallel Universe.
You end up with two golems that can make each other attack the opponent for free, with each attack reactivating their skill (because that's how the game works). In other words, infinite damage at the cost of much clicking.
Credit for the combo goes to Serprex, and to whoever came up with the SoI+Boomstick combo (I can't find the thread).
From the few test games I played, this (rudimentary) version usually wins in 12~16 plies but can sometimes reach 10 plies or less. Some juicy replays:
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