Radiant Solar trigger, venturing into the Oubliette room, causing you to discard a card and then sacrifice
Hostage Taker.
Hostage Taker leaves the battlefield, causing
Tomb of Horrors Adventurer to be returned to the battlefield from exile.
When
Tomb of Horrors Adventurer enters, it and
Radiant Solar trigger.
Resolve the
Tomb of Horrors Adventurer trigger, venturing into the Cradle of the Death God room, creating a 4/4 legendary The Atropal creature token and completing
Tomb of Annihilation.
If you control two or more The Atropal tokens, put all but one into your graveyard due to the legend rule.
Sefris' second ability triggers, returning
Hostage Taker from your graveyard to the battlefield.
When
Hostage Taker enters, it and
Radiant Solar trigger.
Resolve the
Hostage Taker trigger, exiling
Tomb of Horrors Adventurer until
Hostage Taker leaves the battlefield.
Resolve the
Radiant Solar trigger from step 10, venturing into
Tomb of Annihilation and into the Trapped Entry room, causing each player to lose 1 life.
Resolve the
Radiant Solar trigger from step 6, venturing into the Oubliette room, causing you to discard a card and then sacrifice
Hostage Taker.
Repeat from step 5.
Results
Near-infinite creature ETB.
Near-infinite creature LTB.
Near-infinite death triggers.
Near-infinite lifeloss for all players.
Near-infinite creature sacrifice triggers.
Metadata
Bracket tag
ExhibitionBracket 1+
For any deck
1
2
3
4
5
1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.