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According to the announcement last week, Chaos Vault is a place for Wizards to "stretch our creative muscles or just do one-off, cool, weird things from launching sales at unusual times to offering up unusual items"

The player who controlled that permanent at the time it was exiled will create a Detective

Whenever a player casts a spell of the chosen color, that player loses 1 life

Please note that adventure spells are not "alternate costs" they are just another spell, so you cannot get both for free

Even then, getting information from your opponents hand is always strong, and outside of hyper-aggressive burn or creature decks, this is good enough as a 4x main deck card