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

Cast Ugin's Nexus by paying {5}.
Activate Adagia by paying {3}{W} and tapping it, creating a token copy of Ugin's Nexus.
Put the Ugin's Nexus token into exile due to the legend rule and its replacement effect, causing you to take an extra turn after this one.
Activate Meticulous Excavation by paying {2}{W}, returning Ugin's Nexus from the battlefield to your hand.
Repeat each turn.

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