Activate Urza by tapping Scaretiller, adding {U}.
Scaretiller triggers, returning Gateway Plaza from your graveyard to the battlefield tapped.
Gateway Plaza enters the battlefield, triggering itself and Retreat to Coralhelm.
Resolve the Gateway Plaza trigger, choosing to sacrifice it.
Resolve the Retreat to Coralhelm trigger, untapping Scaretiller.
Repeat.

Infinite blue mana

Infinite landfall triggers

Infinite tap triggers

Play all cards in your library without paying their mana costs

Scaretiller

Retreat to Coralhelm

Gateway Plaza

Urza, Lord High Artificer

Activate Scaretiller by tapping it, creating a 1/1 Elf Warrior creature token.
Scaretiller triggers, returning Gateway Plaza from your graveyard to the battlefield tapped.
Gateway Plaza enters the battlefield, triggering itself and Retreat to Coralhelm.
Resolve the Gateway Plaza trigger, choosing to sacrifice it.
Resolve the Retreat to Coralhelm trigger, untapping Scaretiller.
Repeat.

Infinite creature tokens

Infinite ETB

Presence of Gond

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