Radiant Solar, Sefris of the Hidden Ways, Glorious Protector, and Displacer Beast

Prerequisites

• Radiant Solar on the battlefield
• Sefris of the Hidden Ways on the battlefield
• Glorious Protector in hand
• Displacer Beast on the battlefield
• available

Steps

1. Cast Glorious Protector by paying its mana cost
2. When Glorious Protector enters, it and Radiant Solar trigger
3. Resolve the Glorious Protector trigger, exiling Displacer Beast until Glorious Protector leaves the battlefield
4. Resolve the Radiant Solar trigger, venturing into the Oubliette room, causing you to discard a card and then sacrifice Glorious Protector
5. Glorious Protector leaves the battlefield, causing Displacer Beast to be returned to the battlefield from exile
6. When Displacer Beast enters, it and Radiant Solar trigger
7. Resolve the Displacer Beast 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 Glorious Protector from your graveyard to the battlefield
10. When Glorious Protector enters, it and Radiant Solar trigger
11. Resolve the Glorious Protector trigger, exiling Displacer Beast until Glorious Protector 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 Glorious Protector
14. Repeat from step 5
15. Cast [[Permanent with ETB: "Exile a creature" and LTB: "Return exiled creature to BF" (Banish Creature)|banisher]] by paying its mana cost
16. When Glorious Protector enters, it and Radiant Solar trigger
17. Resolve the Glorious Protector trigger, exiling Radiant Solar and two other nontoken creatures until Glorious Protector leaves the battlefield
18. Resolve the Radiant Solar trigger, venturing into the "Sandfall Cell" room, causing you to sacrifice Glorious Protector and each opponent to either sacrifice a creature, artifact or land or lose 2 life
19. Glorious Protector leaves the battlefield, returning Radiant Solar and the two other nontoken creatures from exile to the battlefield
20. Radiant Solar and the two creatures enter the battlefield, triggering Radiant Solar three times
21. Resolve the first Radiant Solar trigger, venturing into the "Cradle of the Death God" room, creating a 4/4 The Atropal legendary creature token, and completing Tomb of Annihilation
22. Sefris' second ability triggers, returning Glorious Protector from your graveyard to the battlefield
23. When Glorious Protector enters, it and Radiant Solar trigger
24. Resolve the Glorious Protector trigger, exiling Radiant Solar and two other nontoken creatures until Glorious Protector leaves the battlefield
25. Resolve the Radiant Solar trigger, venturing into the "Trapped Entry" room of the Tomb of Annihilation, causing each player to lose 1 life
26. Resolve the second Radiant Solar trigger from step 6, venturing into the "Veils of Fear" room, causing each player to lose 2 life unless they discard a card
27. Repeat from step 4

Results

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