Preston, the Vanisher + Delney, Streetwise Lookout + Sefris of the Hidden Ways + Bloodflow Connoisseur + Stirring Bard
Preston, the Vanisher
Delney, Streetwise Lookout
Sefris of the Hidden Ways
Bloodflow Connoisseur
Stirring Bard
Infinite artifact ETBInfinite artifact LTBInfinite artifact sacrifice triggersInfinite artifact tokensInfinite +1/+1 counters on creatures you controlInfinite creature ETBInfinite creature LTBInfinite Treasure tokensInfinite card drawInfinite colored manaInfinite creature tokensInfinite death triggersInfinite draw triggersInfinite creature sacrifice triggersNear-infinite lifelossPut all basic lands from your library into your handPut all creature cards from your library onto the battlefieldReturn most creature cards from your graveyard onto the battlefield
How it works
Complete a dungeon.
Sefris' second ability triggers twice due to Delney.
Resolve the first trigger, returning up to one other creature from your graveyard to the battlefield.
Resolve the second trigger, returning Stirring Bard from your graveyard onto the battlefield.
When Stirring Bard enters, it and Preston trigger twice due to Delney.
Holding priority, activate Bloodflow Connoisseur by sacrificing Stirring Bard.
Resolve a Preston trigger, creating a token copy of Stirring Bard that is a 0/1 Illusion.
When the Stirring Bard token enters, it triggers twice due to Delney.
Resolve the Stirring Bard token triggers, venturing into Undercity twice.
Resolve the second Preston trigger from step 5, creating a token copy of Stirring Bard that is a 0/1 Illusion.
Repeat steps 8 and 9 one additional time.
Resolve the first Stirring Bard trigger from step 5, venturing into Undercity and completing Undercity.