The card was designed to be playable in a normal two-player game, but the thought behind it was that it would be expandable, allowing for a huge effect in large multiplayer games
Cards like Anointed Procession and Doubling Season spin out of control, especially if those are the permanents you copy
I dont think Dragonstorm was unbeatable, and the Mystical Teachings decks I'm referencing definitely beat it, but calling it OK to exist is probably stretching it
If you need a big batch for an event or a gift bundle the price per card might go down with higher quantities
However, thanks to this decks Trainer cards - namely Koga and Budding Expeditioner - this deck has some creative ways of getting around its Pokmons squishiness
Aclazotz, Deepest Betrayal / Temple of the Dead Aclazotz, Deepest Betrayal has midrange stapled all over it