Having copies of this card is very good, considering that you can crew all the copies (or make them crew themselves!) and attack in the air for a ton
The inclusion of the Mystical Archive cards in Strixhaven doesn't change the formats in which these cards are legal
The deckbuilding might be a weak point right now in terms of fostering innovation, but over time this will improve, and the current strategy does a good job at something that's vital to the game: focusing hard on the characters
Stylistically, UAONO leans classy rather than flashy, so it blends in on a shelf or coffee table nice if your gaming space is also your living room
Your opponent does get a creature while you are spending mana and potentially taking a turn to do nothing to your board, which is rarely a good thing, having a steady stream of Soldier tokens flooding the board can cause a lot of chaos in a game
That being said, Amulet is fast enough to tango with Hammer Time, and big enough to outmuscle the midrange decks