Half of the time, the card in this slot is the global version of a Mystical Archive card, and the other half of the time, it's the Japanese alternate-art version of a Mystical Archive card
This has led to a huge proliferation in the counterfeit card subculture, which now has YouTube channels reviewing these cards, a subreddit devoted to helping players find the most realistic counterfeits, and even (supposedly) a ring of players intentionally playing these cards at large events like Pro Tours and Grands Prix in an attempt to prove just how realistic these cards have become
Its upside is huge
Of course, these location focused decks can also be used against you if youre not able to anticipate them
They come in and trigger effects on each turn like a saga, but while they're on the field can also block and attack and behave as normal creatures
Queza, Augur of Agonies The wheels in the Commander deck go round and round