These "symmetrical" artifacts impact the board equally, but Urza's ability to tap artifacts at instant speed gives you a way to break that symmetry to make sure that you will be the only player at the table actually casting spells
Then they pick up to 5 basic Pokemon to put on their bench face down, behind the active one
- Composition : 1 Pack: 7 Cards / 1 Box: 20 Pack (140 Cards)
That powers somewhat tempered by it being a 4-mana play with no immediate impact on the board, which can be dicey in our modern era, but I still like it
It was a new type of mana (something we don't make very often), required a new frame, and interacted with deck building in a new way
Far from the most expensive card on this list, most outlets appraise it for around $9000, based on the price of other prize cards from that era