Ominous Seas + Greater Good + Laboratory Maniac

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.