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

Lock

Glacial Chasm

Icetill Explorer

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 Icetill Explorer.
Because of the additional Icetill Explorer token, you can play an additional land this turn. 
Repeat.

Infinite creature ETB

Infinite creature tokens

Infinite landfall triggers

Infinite black mana

Infinite card draw

Infinite draw triggers

Infinite green mana

Springheart Nantuko

Spelunking

Golgari Rot Farm

Play Golgari Rot Farm. When it enters, Amulet of Vigor, Golgari Rot Farm and Springheart Nantuko trigger.
Resolve the Amulet of Vigor trigger, untapping Golgari Rot Farm.
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 Icetill Explorer.
Because of the additional Icetill Explorer token, you can play an additional land this turn. 
Repeat.

Amulet of Vigor

Cast Walk the Aeons by paying {4}{U}{U}, sacrificing Mystic Sanctuary and two other Islands, causing you to take an extra turn after this one and returning Walk the Aeons to your hand.
Play any Island except Mystic Sanctuary from your graveyard.
When the land enters the battlefield, Aesi triggers, allowing you to draw a card.
Move to your next turn.
Cast Walk the Aeons by paying {4}{U}{U}, causing you to take an extra turn after this one.
Play any Island except Mystic Sanctuary from your graveyard.
When the land enters the battlefield, Aesi triggers, allowing you to draw a card.
Play Mystic Sanctuary from your graveyard.
When Mystic Sanctuary enters the battlefield, it and Aesi trigger.
Resolve the Mystic Sanctuary trigger, putting Walk the Aeons on top of your library from your graveyard.
Resolve the Aesi trigger, causing you to draw Walk the Aeons from the top of your library.
Move to your next turn.
Repeat.

Infinite turns

Aesi, Tyrant of Gyre Strait

Walk the Aeons

Mystic Sanctuary

Activate a land by tapping it, adding at least {1}.
Activate Hearthhull by paying {1}, tapping it and sacrificing a land.
If Hearthhull has eight or more charge counters on it, it triggers, causing each opponent to lose 2 life.
Resolve the Hearthhull ability, causing you to draw two cards and allowing you to play an additional land this turn.
Play the land from your graveyard.
When the land enters the battlefield, Retreat to Coralhelm triggers, untapping Hearthhull
Repeat.

Near-infinite landfall triggers

Near-infinite lifeloss

Hearthhull, the Worldseed

Retreat to Coralhelm

Cast Scouting Trek by paying {1}{G}, searching your library for all basic land cards and putting them onto the top of your library.
Play a land.
When the land enters, Icetill Explorer triggers, causing you to mill a card.
As the milled card will be a land, Hedge Shredder's second ability triggers, putting the land from your graveyard onto the battlefield tapped.
Repeat step 3 until you do not mill a land.

Put all basic lands from your library onto the battlefield tapped

Scouting Trek

Hedge Shredder

Cast Walk the Aeons by paying its mana cost, causing you to take an extra turn after this one.
Activate Dust Bowl by paying {3}, tapping it and sacrificing Mystic Sanctuary, destroying a nonbasic land.
Play Mystic Sanctuary from your graveyard.
When Mystic Sanctuary enters untapped, it triggers, putting Walk the Aeons from your graveyard onto the top of your library.
Move to your next turn, drawing Walk the Aeons during your draw step.
Repeat.

Skip your draw steps

Near-infinite turns

Dust Bowl

Activate a land by tapping it, adding at least {1}.
Activate Hearthhull by paying {1}, tapping it and sacrificing a land.
If Hearthhull has eight or more charge counters on it, it triggers, causing each opponent to lose 2 life.
Resolve the Hearthhull ability, causing you to draw two cards and allowing you to play an additional land this turn.
Play the land from your graveyard.
When the land enters the battlefield, Tireless Provisioner triggers twice due to Roaming Throne, creating two artifact tokens.
Activate Clock of Omens by tapping the artifact tokens, untapping Hearthhull.
Repeat.

Infinite artifact ETB

Infinite artifact tokens

Infinite tapped Treasure tokens

Near-infinite tapped Food tokens

Near-infinite tapped Treasure tokens

Clock of Omens

Tireless Provisioner

Roaming Throne

Cast Enter the Unknown either from your hand by paying {G} or from the top of your library by paying 1 life, causing a creature you control to explore and allowing you to play an additional land this turn.
Play Mystic Sanctuary either from your hand or graveyard.
When Mystic Sanctuary enters the battlefield untapped, it triggers, putting Enter the Unknown from your graveyard onto the top of your library.
Activate Mystic Sanctuary by tapping it, adding {U}.
Activate Zuran Orb by sacrificing Mystic Sanctuary, causing you to gain 2 life.
Repeat.

Infinite lifegain triggers

Infinite lifegain

Infinite storm count

Infinite blue mana

Infinite magecraft triggers

Infinite +1/+1 counters on creatures you control

Enter the Unknown

Bolas's Citadel

Zuran Orb

Cast Enter the Unknown either from your hand by paying {G} or from the top of your library by paying 1 life, causing a creature you control to explore and allowing you to play an additional land this turn.
Play Mystic Sanctuary either from your hand or graveyard.
When Mystic Sanctuary enters the battlefield untapped, it triggers, putting Enter the Unknown from your graveyard onto the top of your library.
Activate Mystic Sanctuary by tapping it, adding {U}.
Activate Overgrown Estate by sacrificing Mystic Sanctuary, causing you to gain 3 life.
Repeat.

Overgrown Estate

Combos with "Icetill Explorer"