That card must be denoted clearly as a proxy and will not be allowed in a different tournament
Unfortunately, since Japanese cards are still relatively new additions to the TCGPlayer database, there isn't a long history of sales data to point to for these cards, but thus far, this Leafeon continues to rise in price, after debuting at close to $200, and soaring to its current market price in short order
Counterfeits are frequently off by 1-2mm in either direction
It already takes long enough to finish a game of Commander without one player intentionally slowing things down and restricting resources
This premise proved fairly popular, and since the 1998 release of Unglued we have seen three more of these Un-sets
Stay out as a buyer, but feel free to sell if you have extras