Radiant Solar, Karmic Guide, Phantom Steed, and Hama Pashar, Ruin Seeker

Prerequisites

• Radiant Solar on the battlefield
• Karmic Guide on the battlefield
• Phantom Steed in hand
• Hama Pashar, Ruin Seeker on the battlefield
• You have ventured into the Tomb of Annihilation twice, choosing the Veils of Fear room
• available

Steps

1. Cast Phantom Steed by paying
2. Radiant Solar and Phantom Steed trigger
3. Resolve Phantom Steed's trigger, exiling Karmic Guide until Phantom Steed leaves the battlefield
4. Resolve Radiant Solar's trigger, venturing into the Sandfall Cell room of Tomb of Annihilation
5. Sandfall Cell triggers twice
6. Resolve one Sandfall Cell trigger, sacrificing Phantom Steed and causing each other player to lose 2 life unless they sacrifice an artifact, creature, or land
7. Karmic Guide enters the battlefield as Phantom Steed's effect ends
8. Radiant Solar and Karmic Guide trigger
9. Resolve Karmic Guide's trigger, returning Phantom Steed from your graveyard to the battlefield
10. Radiant Solar and Phantom Steed trigger
11. Resolve Phantom Steed's trigger, exiling Karmic Guide until Phantom Steed leaves the battlefield
12. Resolve the Radiant Solar trigger from step 10, venturing into the Cradle of the Death God room
13. Cradle of the Death God triggers twice, creating two legendary tokens of The Atropal
14. Put one of The Atropal tokens into the graveyard due to the legend rule
15. Resolve the Radiant Solar trigger from step 8, venturing into the Trapped Entry room of Tomb of Annihilation
16. Trapped Entry triggers twice, causing each player to lose a total of 2 life
17. Resolve the remaining Sandfall Cell trigger from step 5, sacrificing Phantom Steed and causing each other player to lose 2 life unless they sacrifice an artifact, creature, or land
18. Repeat steps 7 through 11
19. Resolve one of Radiant Solar's triggers, venturing into the Veils of Fear room
20. Veils of Fear triggers twice, causing each player to lose 2 life unless they discard a card, twice
21. Repeat from step 4 as many times as the game state allows, choosing a different target in step 3 or 9 to end the loop if necessary

Results

• Near-infinite death triggers
• Near-infinite ETB
• Near-infinite lifeloss
• Near-infinite LTB
• Near-infinite sacrifice triggers
• Near-infinite ventures into the dungeon