Upon coming back, I went deep down the rabbit hole of what the game had to offer, jumping into formats like Commander, Modern, and Legacy, while also seeing what all the fuss was with stuff like Cube
Keith: Keith went a different direction, taking a few spells before anyone else got them
If an Adventure spell leaves the stack in any way other than resolving (most likely by being countered or by failing to resolve because its targets have all become illegal), that card won't be exiled and the spell's controller won't be able to cast it as a permanent later
This may well be as 'Universes Within' cards filling the list slot of set boosters, which is how the mechanically original Stranger Things Secret Lair was reprinted for general access
Its ease of use, low cost, and incredible effect ensure it a place in even the best decks