Activate Uthros and up to three other lands by paying {U} and tapping them, adding at least {4}{W}{U}.
Activate Adagia by paying {3}{W} and tapping it, creating a token copy of Treachery that is legendary attached to any creature.
If you control two legendary Treachery permanents, put one into your graveyard due to the legend rule.
The Treachery token's enter-the-battlefield ability triggers, untapping Adagia, Uthros and up to three other lands.
Repeat.

Infinite mana lands you control can produce

Infinite blue mana

Infinite untap of lands you control

Adagia, Windswept Bastion

Treachery

Uthros, Titanic Godcore

Activate Uthros by paying {U} and tapping it, adding at least seven {U}.
Cast Whispers of the Muse with buyback by paying {5}{U}, causing you to draw a card and return Whispers of the Muse to your hand.
Activate Mind Over Matter by discarding a card, untapping Uthros.
Repeat.

Infinite self-discard triggers

Infinite draw triggers

Infinite looting

Near-infinite storm count

Near-infinite magecraft triggers

Near-infinite untap of permanents you control

Near-infinite mana permanents you control can produce

Mind Over Matter

Whispers of the Muse

Animate Candelabra using The Blackstaff of Waterdeep.
Cast Sakashima the Impostor by paying {2}{U}{U} plus commander tax, if applicable. Choose to have it enter the battlefield as a copy of Candelabra of Tawnos that is still named Sakashima the Impostor and legendary.
Activate Uthros, Titanic Godcore by paying {U} and tapping it, adding at least {U}{U}{U}{U}{U}
Activate Sakashima the Impostor by paying {2} and tapping it, untapping Minamo and Uthros, Titanic Godcore.
Activate Minamo's second ability by paying {U}, untapping Sakashima the Impostor.
Repeat from step 3.

Candelabra of Tawnos

Sakashima the Impostor

Minamo, School at Water's Edge

The Blackstaff of Waterdeep

Activate Uthros by paying {U} tapping it, adding at least six {U}.
Activate a land that enters untapped by tapping it, adding at least {G}.
Activate Oboro Breezecaller by paying {2} and returning the land that taps for {G} from the battlefield to your hand, untapping Uthros
Activate Gretchen by paying {2}{G}{U}, causing you to draw a card and put the land from step 3 onto the battlefield.
Repeat.

Infinite card draw

Near-infinite landfall triggers

Gretchen Titchwillow

Oboro Breezecaller

Activate Uthros, Titanic Godcore by paying {U} and tapping it, adding at least {U}{U}{U}{U}{U}
Cast Venser by paying its mana cost.
When Venser enters as a land due to Ashaya, it and Stone-Seeder Hierophant trigger.
Resolve the Venser trigger, returning it from your graveyard to the battlefield.
Resolve the Stone-Seeder Hierophant trigger, untapping it.
Activate Stone-Seeder Hierophant by tapping it, untapping Uthros, Titanic Godcore.
Repeat.

Infinite LTB

Infinite ETB

Infinite storm count

Infinite green mana

Infinite landfall triggers

Infinite untap of nontoken creatures you control

Infinite mana nontoken creatures you control can produce

Ashaya, Soul of the Wild

Stone-Seeder Hierophant

Venser, Shaper Savant

Activate Uthros by paying {U} and tapping it, adding at least {U}{U}{U}{U}{U}
Activate Trazyn by paying {2} and tapping it, untapping Minamo and Uthros.
Activate Minamo's second ability by paying {U}, untapping Trazyn.
Repeat.

Trazyn the Infinite

Activate Uthros by paying {U} and tapping it, adding {U} for each artifact you control.
Activate Candelabra of Tawnos by paying {2} and tapping it, untapping Uthros and Candelabra of Tawnos as it is a land due to Toph.
Repeat.

Infinite untap of nontoken artifacts you control

Infinite mana nontoken artifacts you control can produce

Toph, the First Metalbender

Combos with "Uthros, Titanic Godcore"