I opened a Cynthia full art, what do i do with it? Hi Guys. I'm suuuper new to the TCG. Out of nostalgia i bought some theme decks and a bunch of boosters so i could start out playing the game. And to my surprise i got a Cynthia Full Art, which after googling turns out to be quite a valuable card.

I'm probably not going to use it myself, and i immediately put it in a sleeve.

What should i do with it? The card would make up my entire investment of cards, but i have no idea where to sell it or how to send it.

Any advice?
Thanks