I don't have anything extraordinary rare like, "only 9 made in the entire world cards" or any cards exclusively at worlds. I spent lots and lots of money on my cards so all my cards are precious to me, buuuuut Im in love with my old cards including my Japanese rocket charizard, my recent zekrom legend, and my most favorite card I own is my legit rayquaza C Lv X ( NOT a promo! ) 146/147 I remember I bought one pack of supreme victors at a family-owned card shop going outta business in Plano. I opened my pack up in the jeep as soon as I got in it and when I saw that card I drooled and freaked out!!!! X'D
I don't remember my most precious card back in the day. I think it was my Ninetails from the Fire + Fighting Basic deck way back when. Now, it's my Typhlosion Prime, not the one in the tin (I have that, though), but the ones from the pack. So I have two Typhlosion Primes, but the pack one is my more valuable one. <3
I think my other most valuable is probably my Meganium Prime, also from the pack.