Sefris of the Hidden Ways + Radiant Solar + Sakashima the Impostor + Chameleon, Master of Disguise

Sefris of the Hidden Ways

Radiant Solar

Sakashima the Impostor

Chameleon, Master of Disguise

How it works

1. Put any nontoken creature onto the battlefield.
2. When the creature enters, Radiant Solar, Chameleon and Sakashima the Impostor 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 Chameleon trigger, venturing into the Oubliette room, causing you to discard a card and then sacrifice Radiant Solar.
5. Resolve the Sakashima the Impostor 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 brilliant engine relies on turning a single creature entry into an avalanche of dungeon progression by utilizing multiple copy effects at once. When a creature enters the battlefield, Radiant Solar, Chameleon, and a copied Sakashima the Impostor all trigger simultaneously to rapidly advance through the Tomb of Annihilation. Along the way, the Oubliette room forces a sacrifice of Radiant Solar, which conveniently sends it to the graveyard just in time for Sefris of the Hidden Ways to trigger its completion payoff. That triggers Sefris's *Create Undead* ability to immediately return Radiant Solar right back to the battlefield, restarting the cycle and allowing you to loop endlessly.