Sefris of the Hidden Ways + Radiant Solar + Vizier of Many Faces + Sakashima's Student

Sefris of the Hidden Ways

Radiant Solar

Vizier of Many Faces

Sakashima's Student

How it works

1. Put any nontoken creature onto the battlefield.
2. When the creature enters, Radiant Solar, Vizier of Many Faces and Sakashima's Student each trigger.
3. Resolve the Radiant Solar trigger, causing you to venture into Tomb of Annihilation and into the Trapped Entry room, causing each player to lose 1 life.
4. Resolve the Vizier of Many Faces trigger, venturing into the Oubliette room, causing you to discard a card and then sacrifice Radiant Solar.
5. Resolve the Sakashima's Student trigger, venturing into the Cradle of the Death God room, creating a 4/4 legendary The Atropal creature token and completing Tomb of Annihilation.
6. If you control two or more The Atropal tokens, put all but one into your graveyard due to the legend rule.
7. Sefris' second ability triggers, returning Radiant Solar from your graveyard to the battlefield.
8. Repeat from step 2.

This loop relies on an endless cycle of entering and leaving the battlefield to constantly complete dungeons and recur your key threats. Radiant Solar fuels your progress by triggering a dungeon venture every time a creature enters, while Vizier of Many Faces and Sakashima's Student clone it (or each other) upon entering to rapidly advance through rooms like Tomb of Annihilation. The sacrifice required by the Oubliette room sends Radiant Solar to the graveyard, which instantly triggers Sefris of the Hidden Ways to resurrect it via Create Undead, restarting the entire sequence.