Cast Walk the Aeons by paying {4}{U}{U}, granting you an extra turn after this one and exiling it due to rebound.
At the beginning of your next upkeep, rebound triggers, causing you to cast the exiled spell without paying its mana cost.
Activate Crystal Shard by tapping it and paying {3} or {U}, returning Venser to your hand.
Cast Venser by paying {2}{U}{U}.
When Venser enters the battlefield, they trigger, returning the extra turn spell to your hand.
Repeat each turn.

Infinite turns

Cast Through Time

Venser, Shaper Savant

Crystal Shard

Walk the Aeons

Cast Walk the Aeons by paying {4}{U}{U}, granting you an extra turn after this one and exiling it due to rebound.
At the beginning of your next upkeep, rebound triggers, causing you to cast the exiled spell without paying its mana cost.
In response, activate Erratic Portal by tapping it and paying {1}, returning Venser to your hand.
Cast Venser by paying {2}{U}{U}.
When Venser enters the battlefield, they trigger, returning the extra turn spell to your hand.
Repeat each turn.

Erratic Portal

Cast Walk the Aeons by paying {4}{U}{U}, granting you an extra turn after this one and exiling it due to rebound.
At the beginning of your next upkeep, rebound triggers, causing you to cast the exiled spell without paying its mana cost.
Activate Portal of Sanctuary by tapping it and paying {1}, returning Venser to your hand.
Cast Venser by paying {2}{U}{U}.
When Venser enters the battlefield, they trigger, returning the extra turn spell to your hand.
Repeat each turn.

Portal of Sanctuary

Cast Walk the Aeons by paying {4}{U}{U}, granting you an extra turn after this one and exiling it due to rebound.
At the beginning of your next upkeep, rebound triggers, causing you to cast the exiled spell without paying its mana cost.
Activate Sanctum of Eternity by tapping it and paying {2}, returning Venser from the battlefield to your hand.
Cast Venser by paying {2}{U}{U}.
When Venser enters the battlefield, they trigger, returning the extra turn spell to your hand.
Repeat each turn.

Sanctum of Eternity

Cast Walk the Aeons by paying its mana cost, causing you to take an extra turn after this one.
Cast Timeless Witness by paying its mana cost.
When Timeless Witness enters the battlefield, it triggers, returning Walk the Aeons from your graveyard to your hand.
Move to your next turn.
Activate Dour Port-Mage by paying {1}{U} and tapping it, returning Timeless Witness from the battlefield to your hand.
Dour Port-Mage triggers, causing you to draw a card.
Repeat.

Dour Port-Mage

Timeless Witness

Cast Walk the Aeons by paying its mana cost, causing you to take an extra turn after this one.
Move to your next turn.
At the beginning of your upkeep, Extravagant Replication triggers, creating a token copy of Timeless Witness.
When the Timeless Witness token enters the battlefield, it triggers, returning Walk the Aeons from your graveyard to your hand.
Repeat.

Extravagant Replication

Activate Mystic Sanctuary by tapping it, adding {U}.
Cast Walk the Aeons by paying its mana cost, causing you to take an extra turn after this one.
Cast Ghostly Flicker by paying {2}{U}, blinking Mystic Sanctuary and Timeless Witness.
When Timeless Witness and Mystic Sanctuary enter the battlefield, they trigger.
Resolve the Timeless Witness trigger, returning Ghostly Flicker from your graveyard to your hand.
Resolve the Mystic Sanctuary trigger, 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

Ghostly Flicker

Mystic Sanctuary

Cast Inspiring Refrain by paying {4}{U}{U}.
Arcane Bombardment triggers, exiling a random instant or sorcery from your graveyard, and then casting a copy of Time Warp and Walk the Aeons without paying their mana costs.
Resolve the Time Warp and Walk the Aeons copies, causing you to take two extra turns after this one.
Resolve Inspiring Refrain, causing you to draw two cards and exile Inspiring Refrain with three time counters on it.
Activate Jhoira's Timebug by tapping it, removing a time counter from Inspiring Refrain.
Move to your first extra turn, removing a time counter from Inspiring Refrain during your upkeep.
Move to your second extra turn, removing a time counter from Inspiring Refrain during your upkeep.
Inspiring Refrain triggers, causing you to cast it from exile without paying its mana cost.
Repeat from step 2.

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