Activate Fertilid by paying {1}{G} and removing a +1/+1 counter from it, causing you to search your library for a basic land card and put it on the battlefield untapped due to Spelunking.
When the basic land enters, Lotus Cobra and Obuun trigger.
Resolve the Lotus Cobra trigger, adding {G}.
Resolve the Obuun trigger, putting a +1/+1 counter on Fertilid.
Activate the basic land by tapping it, adding {1}.
Repeat.

Near-infinite landfall triggers

Put all basic lands from your library onto the battlefield tapped

Fertilid

Lotus Cobra

Spelunking

Obuun, Mul Daya Ancestor

Activate Fertilid by paying {1}{G} and removing a +1/+1 counter from it, causing you to search your library for a basic land card and put it on the battlefield untapped due to Amulet of Vigor.
When the basic land enters, Amulet of Vigor, Lotus Cobra and Obuun trigger.
Resolve the Amulet of Vigor trigger, untapping the basic land.
Resolve the Lotus Cobra trigger, adding {G}.
Resolve the Obuun trigger, putting a +1/+1 counter on Fertilid.
Activate the basic land by tapping it, adding {1}.
Repeat.

Amulet of Vigor

Activate Fertilid by paying {1}{G} and removing a +1/+1 counter from it, causing you to search your library for a basic Forest and put it onto the battlefield tapped.
When the Forest enters, Obuun and Roiling Canopy trigger.
Resolve the Obuun trigger, putting a +1/+1 counter on Fertilid.
Resolve the Roiling Canopy trigger, giving Devoted Druid +3/+3 until end of turn.
Activate Devoted Druid's first ability by tapping it, adding {G}.
Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it.
Repeat steps 5 and 6 once.
Repeat from step 1.

Put all basic Forests from your library onto the battlefield tapped

Devoted Druid

Roiling Canopy

Activate Xavier Sal by tapping it and removing a counter from a permanent you control, creating a token copy of the Forest Dryad token.
When the Forest Dryad enters the battlefield, Intruder Alarm and Obuun trigger.
Resolve the Obuun trigger, putting a counter on a creature you control.
Resolve the Intruder Alarm trigger, untapping all creatures.
Repeat.

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