Sefris of the Hidden Ways, Radiant Solar, Moritte of the Frost, and Spark Double

Prerequisites

• Sefris of the Hidden Ways on the battlefield
• Radiant Solar on the battlefield
• Moritte of the Frost on the battlefield
• Spark Double on the battlefield

Steps

1. Put any nontoken creature onto the battlefield
2. When the creature enters, Radiant Solar, Moritte of the Frost and Spark Double 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 Spark Double 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

Results

• Near-infinite ETB
• Near-infinite LTB
• Near-infinite death triggers
• Near-infinite lifeloss for all players
• Near-infinite sacrifice triggers