yugioh card game Yu-Gi-Oh! THE CHRONICLES making it the largest of the Maze boosters. New to Yu-Gi-Oh! – Yu-Gi-Oh!

Anyway, it's a powerstone that taps for 2 colorless, so you can drop Urza, next turn drop your powerstone, and hopefully the turn after meld them, and then turn around and reduce a lot of costs by a lot

Culling Ritual is interesting here because you can sweep the board of tokens and mana rocks, as well as generate a lot of mana for a single turn to make an explosive play

Including the older Build & Battle boxes

But as far as cards that can be pulled from a pack, Shaymin is indeed the first

3 Mana Vault By Mark Tedin - $199.94 Unlimited Edition (2ED) #260 The most expensive version of Mark Tedin's mana well design, this one is from Unlimited Edition, the second edition of the core set