Preston, the Vanisher + Delney, Streetwise Lookout + Sefris of the Hidden Ways + Ashnod's Altar + Seasoned Dungeoneer
Preston, the Vanisher
Delney, Streetwise Lookout
Sefris of the Hidden Ways
Ashnod's Altar
Seasoned Dungeoneer
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 colorless 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 Seasoned Dungeoneer from your graveyard onto the battlefield.
When Seasoned Dungeoneer enters, it triggers once and Preston triggers twice due to Delney.
Holding priority, activate Ashnod's Altar by sacrificing Seasoned Dungeoneer.
Resolve a Preston trigger, creating a token copy of Seasoned Dungeoneer that is a 0/1 Illusion.
When the Seasoned Dungeoneer token enters, it triggers twice due to Delney.
Resolve the Seasoned Dungeoneer token triggers, venturing into Undercity twice.
Resolve the second Preston trigger from step 5, creating a token copy of Seasoned Dungeoneer that is a 0/1 Illusion.
Repeat steps 8 and 9 one additional time.
Resolve the Seasoned Dungeoneer trigger from step 5, venturing into Undercity and completing Undercity.