Sefris of the Hidden Ways + Radiant Solar + Undercover Operative + Moritte of the Frost

Sefris of the Hidden Ways

Radiant Solar

Undercover Operative

Moritte of the Frost

How it works

1. Put any nontoken creature onto the battlefield.
2. When the creature enters, Radiant Solar, Moritte of the Frost and Undercover Operative 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 Moritte of the Frost trigger, venturing into the Oubliette room, causing you to discard a card and then sacrifice Radiant Solar.
5. Resolve the Undercover Operative 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 ingenious loop turns a single creature entering the battlefield into a complete dungeon-clearing engine, fueled by the recursive prowess of Sefris of the Hidden Ways. When your initial creature arrives, Radiant Solar, Moritte of the Frost, and Undercover Operative all trigger simultaneously to rapidly advance you through the Tomb of Annihilation. Moritte of the Frost and Undercover Operative act as clever copy catalysts that help propel you to the finish line—ultimately completing the dungeon to trigger Sefris of the Hidden Ways' reanimation ability. This brings Radiant Solar right back from the graveyard to the battlefield, neatly resetting the chain so you can repeat the process infinitely.