Activate Venser's first loyalty ability by putting two loyalty counters on it, exiling Deepglow Skate until your end step.
At the beginning of your end step, Venser triggers, returning Deepglow Skate to the battlefield from exile.
When Deepglow Skate enters the battlefield, it triggers, doubling the number of counters on Teferi.
Activate Teferi's third loyalty ability by removing ten loyalty counters from it, causing you to take two extra turns after this one.
Move to your first extra turn.
Activate Teferi's first loyalty ability by putting a loyalty counter on it, causing you to loot.
Repeat steps 1 through 3 one additional time.
Move to your second extra turn.
Repeat.

Infinite turns

Lock

Teferi, Master of Time

Deepglow Skate

Venser, the Sojourner

Cast Temporal Mastery by paying {5}{U}{U}.
Saheeli triggers, creating a 1/1 Servo artifact creature token.
Resolve Temporal Mastery, causing you to take an extra turn after this one and exile it.
Activate Saheeli by removing two loyalty counters from it, causing the Servo to become a copy of Mirror of Fate until end of turn.
Activate the Servo by tapping and sacrificing it, choosing Temporal Mastery and up to six other cards face up in exile, then exiling your library and putting the chosen cards on top of your library, with Temporal Mastery being the top most card.
If Saheeli has less than three loyalty counters on it, activate Venser's first loyalty ability by putting two loyalty counters on it, exiling Saheeli until your next end step.
At the beginning of your end step, if you activated Venser's ability, Venser triggers, returning Saheeli from exile to the battlefield.
Move to your next turn, drawing Temporal Mastery during your draw step.
Repeat.

Saheeli, Sublime Artificer

Mirror of Fate

Temporal Mastery

Activate Liliana's second loyalty ability by removing two loyalty counters from it, searching your library for Nexus of Fate, shuffling your library and putting Nexus of Fate on top of your library.
Activate Venser's first loyalty ability by putting two loyalty counters on it, exiling Liliana until your end step.
Proceed to your combat phase, and declare Yennett as an attacker.
Yennett triggers, revealing Nexus of Fate from the top of your library and causing you to cast it without paying its mana cost.
Resolve Nexus of Fate, getting an extra turn after this one and shuffling it into your library.
At the beginning of your end step, Liliana returns from exile to the battlefield.
Repeat each turn.

Yennett, Cryptic Sovereign

Liliana Vess

Nexus of Fate

Activate Timestream Navigator by paying {2}{U}{U}, tapping it and putting it from the battlefield onto the bottom of your library, causing you to take an extra turn after this one.
Blink Recruiter of the Guard using Venser, the Sojourner.
When Recruiter of the Guard enters, it triggers, searching your library for Timestream Navigator and putting it into your hand.
Cast Timestream Navigator by paying {1}{U}.
Repeat each turn.

Timestream Navigator

Recruiter of the Guard

Blink Wormfang Manta using Venser, the Sojourner. Wormfang Manta's first ability won't trigger due to Hushwing Gryff.
Wormfang Manta's second ability triggers, causing you to take an extra turn after this one.
Repeat each turn.

Wormfang Manta

Hushwing Gryff

Cast Part the Waterveil by paying {4}{U}{U}.
Saheeli triggers, creating a 1/1 Servo artifact creature token.
Resolve Part the Waterveil, causing you to take an extra turn after this one and exile it.
Activate Saheeli by removing two loyalty counters from it, causing the Servo to become a copy of Mirror of Fate until end of turn.
Activate the Servo by tapping and sacrificing it, choosing Part the Waterveil and up to six other cards face up in exile, then exiling your library and putting the chosen cards on top of your library, with Part the Waterveil being the top most card.
If Saheeli has less than three loyalty counters on it, activate Venser's first loyalty ability by putting two loyalty counters on it, exiling Saheeli until your next end step.
At the beginning of your end step, if you activated Venser's ability, Venser triggers, returning Saheeli from exile to the battlefield.
Move to your next turn, drawing Part the Waterveil during your draw step.
Repeat.

Part the Waterveil

Cast Alrund's Epiphany by paying {5}{U}{U}.
Saheeli triggers, creating a 1/1 Servo artifact creature token.
Resolve Alrund's Epiphany, causing you to create two 1/1 Bird creature tokens, take an extra turn after this one and exile Alrund's Epiphany.
Activate Saheeli by removing two loyalty counters from it, causing the Servo to become a copy of Mirror of Fate until end of turn.
Activate the Servo by tapping and sacrificing it, choosing Alrund's Epiphany and up to six other cards face up in exile, then exiling your library and putting the chosen cards on top of your library, with Alrund's Epiphany being the topmost card.
If Saheeli has fewer than three loyalty counters on it, activate Venser's first loyalty ability by putting two loyalty counters on it, exiling Saheeli until your next end step.
At the beginning of your end step, if you activated Venser's ability, Venser triggers, returning Saheeli from exile to the battlefield.
Repeat each turn, drawing Alrund's Epiphany during your draw step.

Alrund's Epiphany

Activate Venser's first loyalty ability by putting two loyalty counters on it, exiling any other permanent you control.
Activate Aminatou's second loyalty ability by removing a loyalty counter from it, blinking Venser.
When Venser leaves the battlefield, Resourceful Defense triggers, putting at least five loyalty counters on Teferi.
Activate Venser's first loyalty ability by putting two loyalty counters on it, exiling Aminatou.
When Aminatou leaves the battlefield, Resourceful Defense triggers, putting at least two loyalty counters on Teferi.
Activate Teferi's third loyalty ability by removing nine loyalty counters from it, causing you to take an extra turn after this one.
At the beginning of your end step, Venser triggers twice, returning Aminatou and the other permanent exiled with it to the battlefield.
Repeat each turn.

Aminatou, the Fateshifter

Teferi, Timebender

Resourceful Defense

Cast Walk the Aeons by paying its mana cost.
Thor's second ability triggers, dealing damage to any target.
Resolve Walk the Aeons, causing you to take an extra turn after this one.
Blink Thor using Venser, the Sojourner.
When Thor enters, it triggers, allowing you to cast Walk the Aeons from your graveyard until the end of your next turn.
Move to your next turn.
Cast Walk the Aeons from your graveyard by paying its mana cost.
Repeat from step 2.

Combos with "Venser, the Sojourner"