Cast Scouting Trek by paying {1}{G}, searching your library for any number of basic land cards and putting them on top of your library.
Cast Cultivator Colossus by paying {4}{G}{G}{G}.
When Cultivator Colossus enters the battlefield, it triggers, causing you to put a land card from your hand onto the battlefield, and then draw a card.
The process in step 3 repeats until you are unable to put a land onto the battlefield.

Put all basic land cards from your library onto the battlefield

Cultivator Colossus

Scouting Trek

Cast Scouting Trek by paying {1}{G}, searching your library for all basic lands in your library and putting them on top.
Play any land.
The land enters the battlefield, triggering Retreat to Coralhelm, causing you to scry 1, ensuring to leave the basic land on top of your library.
Galadriel triggers, causing you to reveal the basic land on top of your library and put it onto the battlefield tapped.
Repeat from step 3.

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