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

Azusa, Lost but Seeking

Perennial Behemoth

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.
Pass the turn.
At the beginning of your next upkeep, Glacial Chasm's cumulative upkeep ability triggers, causing you to put an age counter on it and lose 2 life.
Play any land from your graveyard.
Pass the turn.
At the beginning of your next upkeep, Glacial Chasm's cumulative upkeep ability triggers.
Holding priority, activate Zuran Orb by sacrificing Glacial Chasm, causing you to gain two life.
Resolve the Glacial Chasm trigger, doing nothing.
Repeat.

Zuran Orb

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

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 step

Near-infinite extra 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 card draw

Near-infinite lifeloss

Infinite draw triggers

Near-infinite landfall triggers

Infinite tapped Treasure tokens

Near-infinite tapped Food tokens

Near-infinite tapped Treasure tokens

Hearthhull, the Worldseed

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

Infinite landfall triggers

Enter the Unknown

Bolas's Citadel

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 "Perennial Behemoth"