Preston, the Vanisher + Delney, Streetwise Lookout + Sefris of the Hidden Ways + Umbral Collar Zealot + Passageway Seer

Preston, the Vanisher

Delney, Streetwise Lookout

Sefris of the Hidden Ways

Umbral Collar Zealot

Passageway Seer

How it works

1. Complete a dungeon.
2. Sefris' second ability triggers twice due to Delney.
3. Resolve the first trigger, returning up to one other creature from your graveyard to the battlefield.
4. Resolve the second trigger, returning Passageway Seer from your graveyard onto the battlefield.
5. When Passageway Seer enters, it and Preston trigger twice due to Delney.
6. Holding priority, activate Umbral Collar Zealot by sacrificing Passageway Seer.
7. Resolve a Preston trigger, creating a token copy of Passageway Seer that is a 0/1 Illusion.
8. When the Passageway Seer token enters, it triggers twice due to Delney.
9. Resolve the Passageway Seer token triggers, venturing into Undercity twice.
10. Resolve the second Preston trigger from step 5, creating a token copy of Passageway Seer that is a 0/1 Illusion.
11. Repeat steps 8 and 9 one additional time.
12. Resolve the first Passageway Seer trigger from step 5, venturing into Undercity and completing Undercity.
13. Repeat from step 2.

This elegant loop feeds entirely on the doubling power of Delney, Streetwise Lookout, which supercharges both Preston, the Vanisher's Illusion generation and Sefris of the Hidden Ways' dungeon-completing resurrection triggers. When Sefris brings back Passageway Seer, Delney ensures that both the initiative entry trigger and Preston's copy triggers happen twice, immediately plunging you deeper into the Undercity. Sacrificing the Seer to Umbral Collar Zealot cleans it from the board so the illusions can cycle endlessly, netting you infinite dungeon completions, permanent drops, and infinite resources without ever needing to recast a spell.