Sefris of the Hidden Ways + Radiant Solar + Sakashima of a Thousand Faces + Synth Infiltrator

Sefris of the Hidden Ways

Radiant Solar

Sakashima of a Thousand Faces

Synth Infiltrator

How it works

1. Put any nontoken creature onto the battlefield.
2. When the creature enters, Radiant Solar, Synth Infiltrator and Sakashima of a Thousand Faces 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 Synth Infiltrator trigger, venturing into the Oubliette room, causing you to discard a card and then sacrifice Radiant Solar.
5. Resolve the Sakashima of a Thousand Faces 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 intricate loop hinges on Sefris of the Hidden Ways watching over the graveyard to continuously resurrect Radiant Solar whenever a dungeon completion drops a creature card inside. To multiply the dungeon progress, Synth Infiltrator and Sakashima of a Thousand Faces enter as copies of Radiant Solar, turning every single creature entry into a cascading avalanche of dungeon triggers. Sakashima of a Thousand Faces also conveniently nullifies the legend rule, allowing the final room of the Tomb of Annihilation to churn out multiple copies of The Atropal token—and when the excess tokens are benched to the graveyard, Sefris of the Hidden Ways instantly restarts the entire cycle by pulling Radiant Solar right back to the battlefield.