Radiant Solar + Sefris of the Hidden Ways + Phantom Steed + Rilsa Rael, Kingpin

Radiant Solar

Sefris of the Hidden Ways

Phantom Steed

Rilsa Rael, Kingpin

How it works

1. Cast Phantom Steed by paying its mana cost.
2. When Phantom Steed enters, it and Radiant Solar trigger.
3. Resolve the Phantom Steed trigger, exiling Rilsa Rael until Phantom Steed leaves the battlefield.
4. Resolve the Radiant Solar trigger, venturing into the Oubliette room, causing you to discard a card and then sacrifice Phantom Steed.
5. Phantom Steed leaves the battlefield, causing Rilsa Rael to be returned to the battlefield from exile.
6. When Rilsa Rael enters, it and Radiant Solar trigger.
7. Resolve the Rilsa Rael 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 Phantom Steed from your graveyard to the battlefield.
10. When Phantom Steed enters, it and Radiant Solar trigger.
11. Resolve the Phantom Steed trigger, exiling Rilsa Rael until Phantom Steed 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 Phantom Steed.
14. Repeat from step 5.