Sefris of the Hidden Ways + Radiant Solar + Lagrella, the Magpie

Sefris of the Hidden Ways

Radiant Solar

Lagrella, the Magpie

How it works

1. Cast Lagrella by paying its mana cost.
2. When Lagrella enters, it and Radiant Solar trigger.
3. Resolve the Lagrella trigger, exiling Radiant Solar and two other nontoken creatures until Lagrella leaves the battlefield.
4. Resolve the Radiant Solar trigger, venturing into the "Sandfall Cell" room, causing you to sacrifice Lagrella and each opponent to either sacrifice a creature, artifact or land or lose 2 life.
5. Lagrella leaves the battlefield, returning Radiant Solar and the two other nontoken creatures from exile to the battlefield.
6. Radiant Solar and the two creatures enter the battlefield, triggering Radiant Solar three times.
7. Resolve the first Radiant Solar trigger, venturing into the "Cradle of the Death God" room, creating a 4/4 The Atropal legendary creature token, and completing Tomb of Annihilation.
8. Sefris' second ability triggers, returning Lagrella from your graveyard to the battlefield.
9. When Lagrella enters, it and Radiant Solar trigger.
10. Resolve the Lagrella trigger, exiling Radiant Solar and two other nontoken creatures until Lagrella leaves the battlefield.
11. Resolve the Radiant Solar trigger, venturing into the "Trapped Entry" room of the Tomb of Annihilation, causing each player to lose 1 life.
12. Resolve the second Radiant Solar trigger from step 6, venturing into the "Veils of Fear" room, causing each player to lose 2 life unless they discard a card.
13. Repeat from step 4.

This ingenious loop relies on a clever dance between Sefris of the Hidden Ways and Radiant Solar to rapidly rocket through the *Tomb of Annihilation* dungeon. As Radiant Solar constantly blinks in and out of exile alongside other creatures via Lagrella, the Magpie's entry trigger, its persistent ability continually forces you deeper into the dungeon. The key catalyst is the dungeon's final room, which completes your journey and triggers Sefris of the Hidden Ways' *Create Undead* ability to immediately recur Lagrella from the graveyard, resetting the whole chain.