The two main combos are:
1) Emry + Ascendancy + 0-drop that bins itself (Bauble, 2 of the same Mox, any 0 + Station). Sac the 0, tap Emry targeting it, recast it. This gives you infinite pump and loot. If it's a Mox, you get infinite mana too (you can loot into it). If it's 0 + Station, you point Station at your opponent and mill them out. If you've got Sai or Saheeli on the board, you get infinite tokens.
2) Breach + Station + 0 + artifact/legend/2 open mana (to cast Thassa's Oracle, either directly, or by replacing the 0 with a Mox once you mill into it). Sac 0 to Station, mill yourself for 3, then exile 3 to bring the 0 back and untap Station. You need one other card in the graveyard as a "free cell" until you mill Thassa's Oracle, then on the next loop, you exile that card instead. Mill yourself to 0, then cast Oracle with Breach and win.
Both of these combos can win on turn 2 if you draw good (e.g.: land, Mox Amber, Bauble, Emry, land, Ascendancy; or fetch, 0, 0, Mox Opal, Station, Breach).
Outside of the instant kill combos, Emry + Bauble is a grindy combo that draws you a card for free every turn. Pair that with Sai/Saheeli and you also get a token. Breach can be used as a Regrowth with an additional delve 3 cost, or an expensive hand refill with Bauble and a large number of cards to delve away.