Cast Daydream 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.

Exile all nonland permanents opponents control

Infinite creature ETB

Infinite creature LTB

Infinite blinking of permanents

Infinite creature tokens

Infinite landfall triggers

Infinite mana lands you control can produce

Infinite mana lands you control that enter the battlefield untapped can produce

Preston, the Vanisher

Felidar Guardian

Daydream

Cast Daydream by paying its mana cost, blinking Abdel Adrian.
Abdel Adrian leaves the battlefield, returning Archaeomancer and all other cards that were exiled with it to the battlefield.
Abdel Adrian and Archaeomancer trigger.
Resolve the Archaeomancer trigger, returning Daydream 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 Daydream.
Resolve the Abdel Adrian trigger, exiling Archaeomancer 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.

Infinite blinking of nonland permanents

Infinite magecraft triggers

Infinite storm count

Abdel Adrian, Gorion's Ward

Archaeomancer

Cast Daydream by paying its mana cost.
Holding priority, cast Dualcaster Mage by paying its mana cost.
When Dualcaster Mage enters, it triggers, copying Daydream, with the copy targeting Dualcaster Mage.
Resolve the copy of Daydream, blinking Dualcaster Mage.
Repeat from step 3.

Dualcaster Mage

Cast Daydream by paying {W}, targeting Pinnacle Monk
Storm-Kiln Artist triggers, creating a Treasure artifact token.
Resolve Daydream, blinking Pinnacle Monk
When Pinnacle Monk enters the battlefield, it triggers, returning Daydream to your hand from your graveyard.
Activate the Treasure by tapping and sacrificing it, adding {W}.
Repeat.

Infinite artifact ETB

Infinite artifact LTB

Storm-Kiln Artist

Pinnacle Monk // Mystic Peak

Cast Daydream by paying its mana cost, targeting Practiced Scrollsmith.
Storm-Kiln Artist triggers, creating a Treasure token.
Resolve Daydream, blinking Practiced Scrollsmith.
When Practiced Scrollsmith enters, it triggers, exiling Daydream from your graveyard with the ability to play it until the end of your next turn.
Activate the Treasure by tapping and sacrificing it, adding {W}.
Cast Daydream from exile by paying its mana cost, targeting Practiced Scrollsmith.
Repeat from step 2.

Infinite artifact sacrifice triggers

Practiced Scrollsmith

Cast Daydream by paying its mana cost, blinking Abdel Adrian.
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 the cost of Daydream.
Resolve the Repository Skaab trigger, returning Daydream 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.

Infinite death triggers

Infinite mana nonland permanents you control that enter the battlefield untapped can produce

Infinite creature sacrifice triggers

Repository Skaab

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

Infinite turns

Lock

Scholar of the Ages

Temporal Manipulation

Cast Daydream by tapping Warden of the Eye due to Daydream's convoke ability, blinking Warden of the Eye.
When Warden of the Eye enters, it triggers, returning Daydream from your graveyard to your hand.
Repeat.

Warden of the Eye

Invasion of Segovia // Caetus, Sea Tyrant of Segovia

Combos with "Daydream"