Not only do you have a League Card, but so too does every trainer in-game, from gym leaders to general trains and even your dear friend Hop
They are particularly hard to find in good condition
So where the hell should you start
This black planeswalker excels in many situations, making opponents sacrifice threats that would otherwise be hard to deal with like hexproof creatures, or you can use your cheap removal on their little guy and make them sacrifice the bigger one
Marshadow was a backup Red Card for the hand attack players, allowing them to limit their opponent's resources before their opponent had a chance to play any cards
It's unsurprisingly rare for a Pokemon V to demand more cash than its VMAX and/or VSTAR successor, and for the most part, that tracks with the Go expansion the regular Mewtwo V card is only pulling in $8.45