Sefris of the Hidden Ways, Radiant Solar, and Abdel Adrian, Gorion's Ward

Prerequisites

• Sefris of the Hidden Ways on the battlefield
• Radiant Solar on the battlefield
• Abdel Adrian, Gorion's Ward in hand
• available

Steps

1. Cast Abdel Adrian by paying its mana cost
2. When Abdel Adrian enters, it and Radiant Solar trigger
3. Resolve the Abdel Adrian trigger, exiling Radiant Solar and two other nontoken creatures until Abdel Adrian leaves the battlefield and creating three 1/1 Soldier creature tokens
4. Resolve the Radiant Solar trigger, venturing into the "Sandfall Cell" room, causing you to sacrifice Abdel Adrian and each opponent to either sacrifice a creature, artifact or land or lose 2 life
5. Abdel Adrian 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 Abdel Adrian from your graveyard to the battlefield
9. When Abdel Adrian enters, it and Radiant Solar trigger
10. Resolve the Abdel Adrian trigger, exiling Radiant Solar and two other nontoken creatures until Abdel Adrian leaves the battlefield and creating three 1/1 Soldier creature tokens
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

Results

• Near-infinite ETB
• Near-infinite LTB
• Near-infinite death triggers
• Near-infinite blinking
• Near-infinite lifeloss for all players
• Near-infinite creature tokens