Learning how to sell Pokmon cards gets a lot easier once you understand how the market actually works
Those looking to get their hands on the rare promo cards will have to find a world champion willing to give up their hard-earned trophy - which isn't likely to happen
If you can afford to make that X equal to five mana or more, now everyones best toys are yours, and take note: it says destroy up to X target artifacts, so if you want to pay seven mana to turn a Metallic Mastery into a Slave of Bolas, no ones going to stop you
Still, its a 6/6 flyer with trample
If you arent interested in competitive Magic and just want to play for fun regardless of budget, Commander is perfect theres a reason its the most popular paper format
We saw a similar issue play out with Peregrin Took, which looked like a great card at first but ended up floundering in Lord of the Rings Limited