Preston, the Vanisher
Delney, Streetwise Lookout
Sefris of the Hidden Ways
Barrowin of Clan Undurr

   Prerequisites

What do I need to start this combo?
Barrowin of Clan Undurr in your graveyard.
All other permanents on the battlefield.
You are able to complete a dungeon.

   Steps

How does this combo work?
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 Barrowin of Clan Undurr from your graveyard onto the battlefield.
5
When Barrowin of Clan Undurr enters, it triggers once and Preston triggers twice due to Delney.
6
Resolve a Preston trigger, creating a token copy of Barrowin of Clan Undurr that is a 0/1 Illusion.
7
When the Barrowin of Clan Undurr token enters, it triggers twice due to Delney.
8
Resolve the first Barrowin of Clan Undurr token trigger, venturing into Tomb of Annihilation and into the Trapped Entry room, causing each player to lose 1 life.
9
Resolve the second Barrowin of Clan Undurr token trigger, venturing into the Oubliette room, causing you to discard a card and then sacrifice the nontoken Barrowin of Clan Undurr.
10
Resolve the second Preston trigger from step 5, creating a token copy of Barrowin of Clan Undurr that is a 0/1 Illusion.
11
When the Barrowin of Clan Undurr token enters, it triggers twice due to Delney.
12
Resolve the first Barrowin of Clan Undurr 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.
13
If you control two or more The Atropal tokens, put all but one into your graveyard due to the legend rule.
14
Repeat from step 2.

   Results

What do I get from this combo?
Cast a subset of spells in your library
Near-infinite +1/+1 counters
Near-infinite ETB
Near-infinite LTB
Near-infinite Treasure tokens
Near-infinite card draw
Near-infinite colored mana
Near-infinite creature tokens
Near-infinite death triggers
Near-infinite draw triggers
Near-infinite lifegain
Near-infinite lifegain triggers
Near-infinite lifeloss
Near-infinite lifeloss for all players
Near-infinite sacrifice triggers
Near-infinite ventures into the dungeon
Return most creature cards from your graveyard onto the battlefield
Atraxa, Grand Unifier
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