You can use foreign language copies of legal-for-play cards printed for the TCG market, as long as you can show an official translation of the card, kept outside of your Deck and Deck box, when asked to do so by an opponent or tournament official
So really, what was likely supposed to be a simple workshop tool became a fancy hat that was then wrapped up in the story as they fleshed out Urzas lore
* League Points and Prizes may also change depending on the specifics of the event
If an opponent does, the ability will check again as it tries to resolve
If youre not sure you want to sell / give away / recycle some of your cards, you can always keep them sorted in your regular sorting order in a separate box and put that box not with the regular collection elsewhere
The flash makes it look good, but you will only play it after your opponent plays a creature, which they might not always do