Cast All-Fates Stalker by paying its mana cost.
When All-Fates Stalker enters the battlefield, it triggers, exiling Abdel Adrian.
Abdel Adrian leaves the battlefield, causing Icewind Stalwart to return to the battlefield from exile.
When Icewind Stalwart enters the battlefield, it triggers, blinking All-Fates Stalker.
All-Fates Stalker leaves and enters the battlefield, triggering All-Fates Stalker's first and second abilities.
Resolve the second All-Fates Stalker trigger, returning Abdel Adrian from exile to the battlefield.
When Abdel Adrian enters the battlefield, it triggers, exiling Icewind Stalwart and creating a 1/1 Soldier creature token.
Resolve the All-Fates Stalker trigger from step 5, exiling Abdel Adrian until All-Fates Stalker leaves the battlefield.
Repeat from step 3.

Infinite creature LTB

Infinite creature ETB

Infinite creature tokens

Infinite blinking of nonland permanents

Abdel Adrian, Gorion's Ward

Restoration Angel

All-Fates Stalker

Cast All-Fates Stalker by paying {3}{W}.
When All-Fates Stalker enters, it triggers, blinking itself as it isn't an Assassin due to Conspiracy.
Repeat step 2.

Conspiracy

Activate Kiki-Jiki by tapping it, creating a token copy of All-Fates Stalker.
When the All-Fates Stalker token enters the battlefield, it triggers, exiling Kiki-Jiki until All-Fates Stalker leaves the battlefield.
Activate Goblin Bombardment by sacrificing the All-Fates Stalker token.
When the All-Fates Stalker token dies, Kiki-Jiki is returned from exile to the battlefield.
Resolve the Goblin Bombardment ability.
Repeat.

Infinite creature sacrifice triggers

Infinite death triggers

Infinite damage

Kiki-Jiki, Mirror Breaker

Goblin Bombardment

Cast All-Fates Stalker by paying its mana cost.
When All-Fates Stalker enters, it and Radiant Solar trigger.
Resolve the All-Fates Stalker trigger, exiling Barrowin of Clan Undurr until All-Fates Stalker leaves the battlefield.
Resolve the Radiant Solar trigger, venturing into the Oubliette room, causing you to discard a card and then sacrifice All-Fates Stalker.
All-Fates Stalker leaves the battlefield, causing Barrowin of Clan Undurr to be returned to the battlefield from exile.
When Barrowin of Clan Undurr enters, it and Radiant Solar trigger.
Resolve the Barrowin of Clan Undurr trigger, venturing into the Cradle of the Death God room, creating a 4/4 legendary The Atropal creature token and completing Tomb of Annihilation.
If you control two or more The Atropal tokens, put all but one into your graveyard due to the legend rule.
Sefris' second ability triggers, returning All-Fates Stalker from your graveyard to the battlefield.
When All-Fates Stalker enters, it and Radiant Solar trigger.
Resolve the All-Fates Stalker trigger, exiling Barrowin of Clan Undurr until All-Fates Stalker leaves the battlefield.
Resolve the Radiant Solar trigger from step 10, venturing into Tomb of Annihilation and into the Trapped Entry room, causing each player to lose 1 life.
Resolve the Radiant Solar trigger from step 6, venturing into the Oubliette room, causing you to discard a card and then sacrifice All-Fates Stalker.
Repeat from step 5.

Combos with "All-Fates Stalker"