Researching Pokemon and Magic has shown me that the maximum a card can be in a deck is FOUR (4) times. With Magic it's a bit more complicated in that a player's deck may have as many Lands as he/she desires.
So this has got me thinking that I could have a LIMIT of three (3) Sets of any given Monster.
Three (3) works better with the deck size (which is nine cards) and if you want to be anal about it, that means 3 UNIQUE Monsters sets per deck.
This to me doesn't sound stupid at all. It actually sounds SMART and very tactile strategy to having the right cards (odds-wise).
The question for me is: is capping card limits to three (3) sets sound reasonable? Should you need to validate a player's deck before a game or are cheaters just banned from playing?!
What are your thoughts on this issue??? Please feel free to comment or provide feedback. I'd like to hear what other designers think.
Note #1: @Juzek already suggested in-game costs which I do have. I call them Resource Points (RPs) and each Monster has a limit of 5 RPs. The real issue is someone can use ALL nine (9) Monsters set to be the SAME. I don't want this... It sort of "breaks" the game. You are guaranteed the same Monster, the same Stats and some of the Enhancements.
It makes the game "STUPID": just choose a set and add 9 of those to your deck...! I don't want this KIND of "play style" or method of Deck Construction...
@questccg, you mention the limits, but how are they enforced?
I can't find anything with Google on this. That's why I raised the topic. It doesn't seem like their is any talk of disclosure before or after. IDK.
Magic and Pokemon suffer from FAKE cards (self-reproduced). But my cards will NOT because they are PLASTIC. They are made in Hong Kong. So if an individual wants to spend a lot of money making FAKES, the more affordable idea is just to buy the cards from my webstore.
Getting back to limits... Indeed I don't know what Magic Tournaments do. My guess is that they must validate each player's deck to ensure that there are no "banned" cards or "fake" cards either. My game has neither: no banned cards and no fake cards (as explained above).
But there is the issue with Deck Construction... I WANT to insist on complete "Monster" SETS (3 or 4 cards) as opposed to breaking down some sets just to get the "right" cards for your deck. Breaking down sets is a sort of "free-for-all" format that will be "illegal". Never-the-less some players may try to do this once they've become familiar with the game.
@Let-off: Maybe you are better at Googling than I???
Maybe you could see if you can find anything about deck validation in Magic or Pokemon. Cheers!