Cast Justiciar's Portal 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.

Infinite LTB

Infinite ETB

Infinite creature tokens

Infinite landfall triggers

Infinite blinking of permanents you control

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

Exile any number of nonland permanents

Preston, the Vanisher

Felidar Guardian

Justiciar's Portal

Cast Justiciar's Portal 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 Justiciar's Portal 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 Justiciar's Portal.
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 storm count

Infinite blinking of nonland permanents you control

Infinite magecraft triggers

Abdel Adrian, Gorion's Ward

Archaeomancer

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

Dualcaster Mage

Cast Justiciar's Portal 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 {1}{W}
Resolve the Repository Skaab trigger, returning Justiciar's Portal 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 sacrifice triggers

Infinite death triggers

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

Repository Skaab

Cast Justiciar's Portal by paying its mana cost, blinking Abdel Adrian.
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 Justiciar's Portal 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 Justiciar's Portal.
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.

Invasion of Arcavios // Invocation of the Founders

Cast Surge to Victory by paying {4}{R}{R}, exiling Justiciar's Portal from your graveyard and giving creatures you control +2/+0 until end of turn.
Declare Aurelia as an attacker.
Aurelia triggers, untapping all creatures you control and causing you to get an additional combat phase after this one.
Deal combat damage to an opponent using Aurelia.
Surge to Victory triggers, casting a copy of Justiciar's Portal without paying its mana cost.
Resolve Justiciar's Portal, blinking Aurelia.
Repeat from step 2 each combat phase.

Infinite combat damage

Infinite combat phases

Aurelia, the Warleader

Surge to Victory

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

Infinite turns

Scholar of the Ages

Temporal Manipulation

Cast Justiciar's Portal by paying its mana cost, blinking Abdel Adrian.
Abdel Adrian leaves the battlefield, returning Chakra Meditation and all other cards that were exiled with it to the battlefield.
Abdel Adrian and Chakra Meditation's first ability trigger.
Resolve the Chakra Meditation trigger, returning Justiciar's Portal 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 Justiciar's Portal.
Resolve the Abdel Adrian trigger, exiling Chakra Meditation 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.

Chakra Meditation

Cast the extra turn spell from your graveyard by paying its mana cost.
Holding priority, cast Justiciar's Portal 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.

Extra Turn Spell - GY on Resolution

Emet-Selch, Unsundered // Hades, Sorcerer of Eld

Activate a mana-producing permanent by tapping it, adding at least {2}.
Activate Nimbleclaw Adept by tapping it, untapping Isochron Scepter and the mana-producing permanent.
Activate Isochron Scepter by paying {2} and tapping it, casting a copy of Justiciar's Portal without paying its mana cost.
Resolve Justiciar's Portal, blinking Nimbleclaw Adept.
Repeat.

Combos with "Justiciar's Portal"