It's the headliner of the best ex Starter deck in Pokemon TCG Pocket, so definitely consider redeeming that one if you haven't spent your Deck Ticket already
Our other Supporter card, Sabrina, forces the opponent to switch their Active Pokemon, which can help us out in a pinch
Because many copies are played in decks, Gem Mint 10s are actually scarcer than the population report suggests (many raw copies are played)
Theyre some of the strongest effects in the game because you get to deny your opponent their card, preventing it from affecting the game
if an opponent challenges her, they (and any other opponents in the game, if youre playing Lorcana with more than the standard 2 players) must discard a card
I suggest you prioritize versatile staples like The One Ring or Sol Ring to secure an early advantage