Cast Selective Memory by paying {3}{U}, exiling all nonland cards in your library.
Cast Demonlord Belzenlok by paying {4}{B}{B}.
When Demonlord Belzenlok enters the battlefield, it triggers, exiling the remainder of your library.
The next time you would draw a card, you win the game due to Laboratory Maniac.

Win the game

Exile your library

Demonlord Belzenlok

Selective Memory

Laboratory Maniac

Cast Selective Memory by paying {3}{U}, exiling all nonland cards in your library.
Cast Demonlord Belzenlok by paying {4}{B}{B}.
When Demonlord Belzenlok enters the battlefield, it triggers, exiling the remainder of your library.
Cast Thassa's Oracle by paying {U}{U}.
When Thassa's Oracle enters the battlefield, it triggers, causing you to win the game.

Thassa's Oracle

Cast Selective Memory by paying {3}{U}, exiling all nonland cards in your library.
Cast Demonlord Belzenlok by paying {4}{B}{B}.
When Demonlord Belzenlok enters the battlefield, it triggers, exiling the remainder of your library.
Activate Jace's first loyalty ability by putting a loyalty counter on it, causing you to mill two cards and win the game due to drawing from an empty library.

Combos with "Demonlord Belzenlok"