I've began working on a board game with a friend that involves different types of spaces, all of which have their own decks of cards for things that can happen. It's a space game with "deep space" spaces, and planets. While on a planet space, you must draw one card from that type of planet's deck at the end of your turn. The 7 types of planets plus 4 "Specialist" decks adds up to a total of 12 different decks of cards. We approximated that the decks would have about 50 cards each, adding to a total of 600 cards.

My question is, though, is 600 cards too much? And if so, what could we do to lower the amount? We realize that it's quite a bit of cards, but we're not sure how we could alter the mechanics to allow for less cards.

That's a really good idea, thanks. Probably, though, what we'd do is have each card have 6 different possibilities on it, organized by letter or number. (Color as an extra would work well, too.) There'd still need to be the "Specialist" cards, so that using a card for one specialist wouldn't disqualify another player of one for theirs, but 250 cards is much more managable than 600. That would work well.