You have enough mana to cast Scrollshift.

Cast Scrollshift by paying its mana cost, blinking Felidar Guardian.
Felidar Guardian and Preston trigger.
Resolve the Felidar Guardian trigger, blinking another permanent you control.
Resolve the Preston trigger, creating a token copy of Felidar Guardian that is a 0/1 Illusion.
When the Felidar Guardian token enters the battlefield, it triggers, blinking the nontoken Felidar Guardian.
Repeat from step 2.

You control at least one artifact, creature or enchantment.

Cast Scrollshift by paying , targeting any artifact, creature or enchantment you control.
Holding priority, cast Dualcaster Mage by paying .
When Dualcaster Mage enters the battlefield, it triggers, creating a copy of Scrollshift targeting Dualcaster Mage.
Resolve the copy of Scrollshift, blinking Dualcaster Mage and causing you to draw a card.
Repeat from step 3.

You have enough mana to cast Scrollshift.

Cast Scrollshift by paying its mana cost, blinking Wispweaver Angel.
Wispweaver Angel and Preston trigger.
Resolve the Wispweaver Angel trigger, blinking another creature you control.
Resolve the Preston trigger, creating a token copy of Wispweaver Angel that is a 0/1 Illusion.
When the Wispweaver Angel token enters the battlefield, it triggers, blinking the nontoken Wispweaver Angel.
Repeat from step 2.

You control at least one artifact, creature or enchantment.

Cast Scrollshift by paying , targeting any artifact, creature or enchantment you control.
Holding priority, cast Naru Meha by paying .
When Naru Meha enters the battlefield, it triggers, creating a copy of Scrollshift targeting Naru Meha.
Resolve the copy of Scrollshift, blinking Naru Meha and causing you to draw a card.
Repeat from step 3.

Cast Scrollshift by paying its mana cost, blinking Abdel Adrian and causing you to draw a card.
Abdel Adrian leaves and re-enters the battlefield, causing all cards exiled with it to be returned to the battlefield. Abdel Adrian and Repository Skaab's exploit ability trigger.
Resolve the Repository Skaab trigger, exploiting another creature and triggering its second ability.
Holding priority, activate any number of permanents by tapping them, adding at least [cost].
Resolve the Repository Skaab trigger, returning Scrollshift from your graveyard to your hand.
Resolve the Abdel Adrian trigger, exiling the mana producing permanent(s) and Repository Skaab and creating that many 1/1 Soldier creature tokens.
Repeat.

You have any number of other nonland permanents that enter the battlefield untapped, and that can collectively tap to produce enough mana to cast Scrollshift exiled by Abdel Adrian.

Cast Scrollshift by paying its mana cost, blinking Abdel Adrian and causing you to draw a card.
Abdel Adrian leaves the battlefield, returning Invasion of Arcavios and all other cards that were exiled with it to the battlefield.
Abdel Adrian and Invasion of Arcavios trigger.
Resolve the Invasion of Arcavios trigger, returning Scrollshift from your graveyard to your hand.
Holding priority, activate any number of nonland permanents you control by tapping them, adding at least enough mana to cast Scrollshift.
Resolve the Abdel Adrian trigger, exiling Invasion of Arcavios and the mana-producing permanents until Abdel Adrian leaves the battlefield, and creating a 1/1 Soldier creature token for each permanent exiled this way.
Repeat.

You have enough mana available each turn to cast Walk the Aeons and Scrollshift.

Cast Walk the Aeons by paying its mana cost, taking an extra turn.
Cast Scrollshift by paying its mana cost, blinking Scholar of the Ages.
When Scholar of the Ages enters the battlefield, it triggers, returning Walk the Aeons and Scrollshift from your graveyard to your hand.
Repeat each turn.

You have enough mana to cast the extra turn spell and Scrollshift each turn.
There are at least thirteen cards in your graveyard.

Cast the extra turn spell from your graveyard by paying its mana cost.
Holding priority, cast Scrollshift from your graveyard by paying its mana cost, blinking Hades and causing it to re-enter the battlefield as Emet-Selch.
When Emet-Selch enters the battlefield, it triggers, causing you to loot.
Resolve the extra turn spell, causing you to take an extra turn after this one.
At the beginning of your upkeep during your extra turn, Emet-Selch triggers, transforming itself into Hades.
Repeat.

You must use an extra turn spell that will be put into your graveyard as it resolves, not exile or shuffling into your library.

You have enough mana available each turn to cast Time Warp and Scrollshift.

Cast Time Warp by paying its mana cost, taking an extra turn.
Cast Scrollshift by paying its mana cost, blinking Scholar of the Ages.
When Scholar of the Ages enters the battlefield, it triggers, returning Time Warp and Scrollshift from your graveyard to your hand.
Repeat each turn.

You have enough mana available each turn to cast Temporal Manipulation and Scrollshift.

Cast Temporal Manipulation by paying its mana cost, taking an extra turn.
Cast Scrollshift by paying its mana cost, blinking Scholar of the Ages.
When Scholar of the Ages enters the battlefield, it triggers, returning Temporal Manipulation and Scrollshift from your graveyard to your hand.
Repeat each turn.

You have enough mana available each turn to cast Time Walk and Scrollshift.

Cast Time Walk by paying its mana cost, taking an extra turn.
Cast Scrollshift by paying its mana cost, blinking Scholar of the Ages.
When Scholar of the Ages enters the battlefield, it triggers, returning Time Walk and Scrollshift from your graveyard to your hand.
Repeat each turn.

You have enough mana available each turn to cast Capture of Jingzhou and Scrollshift.

Cast Capture of Jingzhou by paying its mana cost, taking an extra turn.
Cast Scrollshift by paying its mana cost, blinking Scholar of the Ages.
When Scholar of the Ages enters the battlefield, it triggers, returning Capture of Jingzhou and Scrollshift from your graveyard to your hand.
Repeat each turn.