Activate Ominous Seas by removing eight foreshadow counters from it, creating a 8/8 Kraken creature token.
Activate Greater Good by sacrificing the Kraken token, drawing eight cards and discarding three cards.
Ominous Seas triggers eight times, putting eight foreshadow counters on itself.
Repeat until you draw from an empty library, winning the game.

Win the game

Ominous Seas

Greater Good

Laboratory Maniac

Jace, Wielder of Mysteries

Activate O'aka by tapping it and removing a counter from a nonland permanent, causing you to draw a card.
Ominous Seas triggers, putting a counter on it.
Activate Mind Over Matter by discarding a card, untapping O'aka.
Repeat.

Combos with "Ominous Seas"