Preston, the Vanisher + Delney, Streetwise Lookout + Sefris of the Hidden Ways + Shilgengar, Sire of Famine + Bloodboil Sorcerer
Preston, the Vanisher
Delney, Streetwise Lookout
Sefris of the Hidden Ways
Shilgengar, Sire of Famine
Bloodboil Sorcerer
Infinite artifact ETBInfinite artifact LTBInfinite artifact sacrifice triggersInfinite artifact tokensPut all creature cards from your library onto the battlefieldReturn most creature cards from your graveyard onto the battlefieldInfinite +1/+1 counters on creatures you controlInfinite Blood tokensInfinite creature ETBInfinite creature LTBInfinite Treasure tokensInfinite card drawInfinite colored manaInfinite creature tokensInfinite death triggersInfinite draw triggersInfinite rummagingInfinite creature sacrifice triggersInfinite self-discard triggersNear-infinite lifelossPut all basic lands from your library into your hand
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 Bloodboil Sorcerer from your graveyard onto the battlefield.
When Bloodboil Sorcerer enters, it triggers once and Preston triggers twice due to Delney.
Holding priority, activate Shilgengar by sacrificing Bloodboil Sorcerer.
Resolve a Preston trigger, creating a token copy of Bloodboil Sorcerer that is a 0/1 Illusion.
When the Bloodboil Sorcerer token enters, it triggers twice due to Delney.
Resolve the Bloodboil Sorcerer token triggers, venturing into Undercity twice.
Resolve the second Preston trigger from step 5, creating a token copy of Bloodboil Sorcerer that is a 0/1 Illusion.
Repeat steps 8 and 9 one additional time.
Resolve the Bloodboil Sorcerer trigger from step 5, venturing into Undercity and completing Undercity.