Activate Prototype Portal by paying {0} and tapping it, creating a token copy of Silverbluff Bridge.
When Silverbluff Bridge enters the battlefield, Tiller Engine triggers, untapping it.
Activate the Silverbluff Bridge token by tapping it, adding {U}.
Activate Filigree Sages by paying {U}, untapping Prototype Portal.
Repeat.

Infinite landfall triggers

Infinite tapped Mountain tokens

Infinite tapped Island tokens

Infinite tapped Forest tokens

Infinite tapped Plains tokens

Infinite tapped Swamp tokens

Infinite tapped copies of a specific land

Filigree Sages

Prototype Portal

Silverbluff Bridge

Tiller Engine

Zirda, the Dawnwaker

Power Artifact

Training Grounds

Agatha of the Vile Cauldron

Biomancer's Familiar

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