Preston, the Vanisher + Delney, Streetwise Lookout + Sefris of the Hidden Ways + Cloister Gargoyle
Preston, the Vanisher
Delney, Streetwise Lookout
Sefris of the Hidden Ways
Cloister Gargoyle
Cast a subset of spells in your libraryNear-infinite +1/+1 countersNear-infinite creature ETBNear-infinite creature LTBNear-infinite Treasure tokensNear-infinite card drawNear-infinite colored manaNear-infinite creature tokensNear-infinite death triggersNear-infinite draw triggersNear-infinite lifegainNear-infinite lifegain triggersNear-infinite lifelossNear-infinite lifeloss for all playersNear-infinite creature sacrifice triggersNear-infinite ventures into the dungeonReturn 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 Cloister Gargoyle from your graveyard onto the battlefield.
When Cloister Gargoyle enters, it and Preston trigger twice due to Delney.
Resolve a Preston trigger, creating a token copy of Cloister Gargoyle that is a 0/1 Illusion.
When the Cloister Gargoyle token enters, it triggers twice due to Delney.
Resolve the first Cloister Gargoyle token trigger, venturing into Tomb of Annihilation and into the Trapped Entry room, causing each player to lose 1 life.
Resolve the second Cloister Gargoyle token trigger, venturing into the Oubliette room, causing you to discard a card and then sacrifice the nontoken Cloister Gargoyle.
Resolve the second Preston trigger from step 5, creating a token copy of Cloister Gargoyle that is a 0/1 Illusion.
When the Cloister Gargoyle token enters, it triggers twice due to Delney.
Resolve the first Cloister Gargoyle token trigger, venturing into the Cradle of the Death God room, creating a 4/4 legendary The Atropal creature token and completing Tomb of Annihilation.
If you control two or more The Atropal tokens, put all but one into your graveyard due to the legend rule.