The Wombo Combo, usually around turn 6-7:
Step 1: Get some mana dorks/rocks into play
Step 2: Put mystic forge and either paradox engine, forsaken monument, or both into play.
Step 3: Play your deck. Mystic forges and a paradox engine can deal with lands on top, but there are plenty of other ways to do it.
Step 4: To kill them, pull the aetherflux reservoir from Karn.

The alternate win con is Ugin, The Spirit Dragon, which can be played as early as turn 4:
Turn 1: Land
Turn 2: Land + any 2 drop (for automated artificer, you\’ll need an interplanar beacon into play to dodge the restriction)
Turn 3: Land + hedron archive + any 2 drop
Turn 4: Land + Ugin, The Spirit Dragon

The 4 combo pieces are necessary for the sideboard, but the other three can be whatever you want.
Golos and cascading cataracts can also be put into this deck.