Preston, the Vanisher + Delney, Streetwise Lookout + Sefris of the Hidden Ways + Bartolomé del Presidio + Avenging Hunter

Preston, the Vanisher

Delney, Streetwise Lookout

Sefris of the Hidden Ways

Bartolomé del Presidio

Avenging Hunter

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 Avenging Hunter from your graveyard onto the battlefield.
5. When Avenging Hunter enters, it triggers once and Preston triggers twice due to Delney.
6. Holding priority, activate Bartolomé del Presidio by sacrificing Avenging Hunter.
7. Resolve a Preston trigger, creating a token copy of Avenging Hunter that is a 0/1 Illusion.
8. When the Avenging Hunter token enters, it triggers twice due to Delney.
9. Resolve the Avenging Hunter token triggers, venturing into Undercity twice.
10. Resolve the second Preston trigger from step 5, creating a token copy of Avenging Hunter that is a 0/1 Illusion.
11. Repeat steps 8 and 9 one additional time.
12. Resolve the Avenging Hunter trigger from step 5, venturing into Undercity and completing Undercity.
13. Repeat from step 2.

This intricate loop begins by using Sefris of the Hidden Ways to reanimate Avenging Hunter, whose power of 2 or less lets Delney, Streetwise Lookout double its entry triggers as well as Sefris's dungeon-crawling abilities. When Avenging Hunter enters the battlefield, Preston, the Vanisher creates a pair of 0/1 Illusion token copies of it, while Bartolomé del Presidio stands ready to sacrifice the original to feed the graveyard and set up the next iteration. As Delney multiplies the initiative-taking triggers and dungeon advancement from these Avenging Hunter tokens, you rapidly complete the Undercity dungeon to restart the Sefris reanimation engine.