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Venture into the Dungeon with the Battle for Baldur’s Gate Draft Event! (New special dungeon for the event)
(wpn.wizards.com)
No word on if it will be legal for regular play, but not likely given its size
@MysticKetchup dungeons, as "non-standard magic cards" don't need to comply with most rules about card legality.
But as Tabak didn't knowabout it shouldn't be legal, but we need a CR update to make that so.