It has a powerful ETB effect when first played, and then if your opponent can't deal with it fast, it eventually becomes a creature and gets to reuse that effect over and over as it attacks
After a decade out of the card game, ACE SPEC cards were reintroduced in Japanese Scarlet & Violet expansions Wild Force and Cyber Judge (released in English as Temporal Forces), which also introduced the first ACE SPEC Special Energy card, Neo Upper Energy
This archetype is especially strong when artifact cards are not only for the artifact deck. A good artifact creature can be aggro filler, sacrifice fodder, blink material, or equipment carrier
If you play as well as possible you shouldn't be worried about a few drawbacks in some scenarios
Commons/uncommons/rares together Holofoils and reverse holofoils together EX, GX, V, Vmax, and Ultra rares together All Cards over $5.00 will be batched together
Establishing Condition (Consistently) Most major grading companies use a 1 to 10 scale and consistently assess condition, often factoring in sub-areas such as: Centring Corners Card edges Surface Printing quality This is crucial because buyers often pay significantly more for cards with strong rarity, scarcity, and verified high condition