Preston, the Vanisher + Delney, Streetwise Lookout + Sefris of the Hidden Ways + Stirring Bard + Phantom Train

Preston, the Vanisher

Delney, Streetwise Lookout

Sefris of the Hidden Ways

Stirring Bard

Phantom Train

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

This ingenious loop begins by using Sefris of the Hidden Ways to reanimate Stirring Bard directly from your graveyard, a process amplified by Delney, Streetwise Lookout to trigger multiple recursion effects at once. As Stirring Bard enters the battlefield uncast, Preston, the Vanisher swoops in to create a flurry of 0/1 Illusion token copies, while Phantom Train stands ready to sacrifice the original Bard to keep the engine fueled. Because Delney doubles every low-power creature's triggered ability, each entering Stirring Bard or its token copy pushes you deep into the dungeon of Undercity with staggering speed, ultimately completing the dungeon over and over to achieve infinite value across every imaginable permanent, trigger, and resource type.