Would there be different cards for each cats different forms? (Ex. Squirrelpaw -> Squirrelflight)
If so can you have both forms of the same cat in a single deck?
Yes! And you can have multiple forms of the same cat in the same deck.
The cards are still in a concept phase, but what I'm thinking of is putting out cards by book if that makes sense? That way there can be variants of the same character with different stats and skills.
For example an "Into the Wild" set could have Tigerclaw as a Thunderclan Warrior while a "Rising Storm" set would have Tigerstar as a Shadowclan Leader.
An example of card variants, an "Into the Wild" set would have a regular Bluestar card while a "Bluestar's Prophecy" set would have a special full art Bluestar.
That way there can be more variety with the cards and multiple skillsets can be available for each character. If someone likes to use Bluestar but isn't a huge fan of her current skill/stats, maybe another version would be more suited to them. And also it's just fun to have different versions^^