Preston, the Vanisher + Delney, Streetwise Lookout + Sefris of the Hidden Ways + Yahenni, Undying Partisan + Feywild Caretaker

Preston, the Vanisher

Delney, Streetwise Lookout

Sefris of the Hidden Ways

Yahenni, Undying Partisan

Feywild Caretaker

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

This intricate loop revolves around the synergy of doubling triggers and looping dungeon completions to generate infinite value. By using Sefris of the Hidden Ways to recur threats, Delney, Streetwise Lookout ensures that both the creature-return triggers and the resulting entry effects double up, allowing Feywild Caretaker to repeatedly seize the initiative and blitz through the Undercity. Meanwhile, Preston, the Vanisher swoops in to multiply your entry triggers by spitting out 0/1 Illusion copies of the caretaker, while Yahenni, Undying Partisan safely consumes those bodies on demand to fuel a continuous cycle of sacrifice and rebirth.