Activate Thawing Glaciers by paying ({1} magic symbol) and tapping it, searching your library for a basic land card and putting it onto the battlefield tapped.
The land enters the battlefield, triggering Retreat to Coralhelm, untapping Ley Weaver.
Activate Ley Weaver by tapping it, untapping Thawing Glaciers and the basic land.
Activate the basic land by tapping it, adding ({1} magic symbol) .
Repeat.
Results
Near-infinite landfall triggers.
Near-infinite untap of lands you control.
Put all basic lands from your library onto the battlefield.