all art rare pokemon cards Assorted Lot of 10 Ultra Rares Stage 1 All Pokémon TCG card images The Pokémon Company Pokemon EX Cards - Choose

If truly sealed ones could be found, those would surely top this list with ease

1 Vivi Ornitier Offers Excellent Mana Ramp For A Variety Of Decks Dishing Out Damage While Building Up Your Manabase Surpassing the expectations of a Red and Blue combo card, Vivi Ornitier is just as excellent a mana ramp as it is a danger to your opponents

[Fighting] Pure Power Put 4 damage counters on your opponent's Pokemon in any way you like

Miirym, Sentinel Wyrm can give you a second copy, and the next time you give something a +1/+1 counter, be it Cathars' Crusade or a dragon with devour, you get as many +1/+1 counters as you like

Of course, you can always be selfish and use that mana to fuel cards like Electrodominance and Retrofitter Foundry, but where's the fun in that