Play Glacial Chasm either from your hand or from your graveyard.
When Glacial Chasm enters the battlefield, its second ability triggers, causing you to sacrifice another land you control.
Play any land from your graveyard.
At the beginning of your next upkeep, Glacial Chasm's cumulative upkeep ability triggers, allowing you to choose not to pay the cost and sacrifice it instead.
Repeat.

Prevent all damage that would be dealt to you

Glacial Chasm

Oracle of Mul Daya

Ramunap Excavator

Play Golgari Rot Farm. When it enters untapped due to Spelunking, Golgari Rot Farm and Springheart Nantuko trigger.
Holding priority, activate Golgari Rot Farm by tapping it, adding {B}{G}.
Resolve the Golgari Rot Farm trigger, returning it from the battlefield to your hand.
Resolve the Springheart Nantuko trigger, causing you to pay {1}{G} to create a token copy of Oracle of Mul Daya.
Because of the additional Oracle of Mul Daya token, you can play an additional land this turn. 
Repeat.

Infinite creature tokens

Infinite landfall triggers

Infinite ETB

Springheart Nantuko

Golgari Rot Farm

Spelunking

Play Gruul Turf. When it enters, Amulet of Vigor, Gruul Turf and Springheart Nantuko trigger.
Resolve the Amulet of Vigor trigger, untapping Gruul Turf.
Holding priority, activate Gruul Turf by tapping it, adding {R}{G}.
Resolve the Gruul Turf trigger, returning it from the battlefield to your hand.
Resolve the Springheart Nantuko trigger, causing you to pay {1}{G} to create a token copy of Oracle of Mul Daya.
Because of the additional Oracle of Mul Daya token, you can play an additional land this turn. 
Repeat.

Gruul Turf

Amulet of Vigor

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