Radiant Solar, Sefris of the Hidden Ways, Passageway Seer, and All-Fates Stalker

Prerequisites

• Radiant Solar on the battlefield
• Sefris of the Hidden Ways on the battlefield
• Passageway Seer on the battlefield
• All-Fates Stalker in hand
• available

Steps

1. Cast All-Fates Stalker by paying its mana cost
2. When All-Fates Stalker enters, it and Radiant Solar trigger
3. Resolve the All-Fates Stalker trigger, exiling Passageway Seer until All-Fates Stalker leaves the battlefield
4. Resolve the Radiant Solar trigger, venturing into the Oubliette room, causing you to discard a card and then sacrifice All-Fates Stalker
5. All-Fates Stalker leaves the battlefield, causing Passageway Seer to be returned to the battlefield from exile
6. When Passageway Seer enters, it and Radiant Solar trigger
7. Resolve the Passageway Seer trigger, venturing into the Cradle of the Death God room, creating a 4/4 legendary The Atropal creature token and completing Tomb of Annihilation
8. If you control two or more The Atropal tokens, put all but one into your graveyard due to the legend rule
9. Sefris' second ability triggers, returning All-Fates Stalker from your graveyard to the battlefield
10. When All-Fates Stalker enters, it and Radiant Solar trigger
11. Resolve the All-Fates Stalker trigger, exiling Passageway Seer until All-Fates Stalker leaves the battlefield
12. 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
13. 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
14. Repeat from step 5

Results

• Near-infinite ETB
• Near-infinite LTB
• Near-infinite death triggers
• Near-infinite lifeloss for all players
• Near-infinite sacrifice triggers