Preston, the Vanisher + Delney, Streetwise Lookout + Sefris of the Hidden Ways + Thermopod + Vicious Battlerager

Preston, the Vanisher

Delney, Streetwise Lookout

Sefris of the Hidden Ways

Thermopod

Vicious Battlerager

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

This intricate loop relies on Delney, Streetwise Lookout to supercharge your triggers, doubling the recursion and venture effects that keep the engine spinning. Once you have completed a dungeon, Sefris of the Hidden Ways brings back Vicious Battlerager, whose enter-the-battlefield trigger and Preston, the Vanisher's copy ability both trigger twice under Delney's watchful eye. By feeding the resulting Illusions and originals to Thermopod for mana, you continuously cycle Vicious Battlerager to endlessly advance through the Undercity dungeon, reaping infinite resources and graveyard recursion along the way.