Cast Transcendence by paying {3}{W}{W}{W}.
Transcendence triggers due to you having 20 or more life. However, you cannot lose the game due to Herald of Eternal Dawn.
Step 2 repeats in an infinite loop, causing the game to end in a draw if it isn't interacted with.

Draw the game

Transcendence

Herald of Eternal Dawn

Cast Fractured Identity by paying {3}{W}{U}, exiling Nine Lives and causing each opponent to create a token copy of it.
Nine Lives leaves the battlefield, however you cannot lose the game due to Herald of Eternal Dawn.
Cast Austere Command by paying its mana cost, destroying all enchantments.
When each opponent's Nine Lives leaves the battlefield, they each trigger, causing each opponent to lose the game.

Each opponent loses the game

Nine Lives

Fractured Identity

Austere Command

Draw a card.
Niv-Mizzet triggers, dealing 1 damage to you.
Vilis triggers, causing you to draw a card.
Repeat from step 2 until your library is empty, preventing a game loss with Herald of Eternal Dawn.

Infinite card draw

Infinite draw triggers

Vilis, Broker of Blood

Niv-Mizzet, Parun

Activate Frenetic Efreet an arbitrarily large number of times by paying {0}.
Resolve a Frenetic Efreet ability, causing you to flip a coin.
Karplusan Minotaur triggers. If you won the flip, it deals 1 damage to any target you choose. If you lost the flip, it deals 1 damage to a target of an opponent's choosing. You cannot lose the game due to this damage due to Herald of Eternal Dawn, and Karplusan Minotaur and Herald of Eternal Dawn cannot be destroyed due to its indestructibility or protection.
Repeat from step 2.

Combos with "Herald of Eternal Dawn"