Sefris of the Hidden Ways + Radiant Solar + Phantasmal Image + Moritte of the Frost

Sefris of the Hidden Ways

Radiant Solar

Phantasmal Image

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 Phantasmal Image 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 Phantasmal Image 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 turns a simple creature entry into a self-sustaining loop that rockets you through the Tomb of Annihilation dungeon over and over again. By having Moritte of the Frost and Phantasmal Image enter as clever copies of your key pieces alongside Radiant Solar, every single loop triggers a cascade of dungeon room advancements. Radiant Solar fuels the initial push, while the legend rule cleverly forces your extra copies into the graveyard as you reach the Cradle of the Death God. That graveyard entry triggers Sefris of the Hidden Ways, whose Create Undead ability immediately plucks Radiant Solar right back to the battlefield to reset the entire cycle for near-infinite value.