Its normally a 4/4 flyer for five, but when it mutates, for a cost of 5U, you gain control of target noncreature artifact
So, most (but not all) Starter Kit cards are legal in Standard until they rotate out
Each Strixhaven draft booster and set booster have one Mystical Archive card, with set boosters also possibly having a foil Archive card in the dedicated foil slot
Note: there are NO unique cards in the boosters, so anything available in the boosters can be acquired in the deck
The most talked-about chase cards include Buzz Lightyear Jungle Ranger, Merida Formidable Archer and several of the sets Enchanted cards
If you want to lean into those synergies and basically just rework the precon, you definitely want to rock that one-two punch