I have a lot of experience at the Pokemon TCG, if that helps. I have made loads and loads and loads and loads (and loads) of cards. But I don't think that something similar to Pokemon is what we want here... I think we want something closer to Magic or Yu Gi Oh.
So here's my idea. For the moment, anyway.
It would be a Dom vs Dom game.
Each player would have Will Points (WP) which would serve as their life points. If a player's WP is depleted, they are considered to be hypnotized by the opponent, and lose the game.
There would be a variety of card types, and some of them could inflict "damage" on the opponent's WP (or on your own, in some cases, as part of paying certain card's costs). However, there would be Slave cards, which are essentially your characters/monsters from other TCGs. Slaves protect the Master (the player) from taking WP damage, so as long as you have Slaves in play, the opponent will be unable to damage the Master's WP (except in some cases where some cards will ignore Slaves and directly attack the Master, but often for less damage). Obviously, Slaves have less WP than the Master does.
Slaves would come in many types. Perhaps we could categorize them in the way that other TCGs do with "colors" for different types. For example:
Magic = Blue (Focuses on trickery and disruption of the opponent's play)
Technology = Silver (Focuses on attack and defense, with low trickery capabilities)
Parasite = Green (Focuses on overwhelming the opponent with large numbers of cards in play.)
Corruption = Black (Focuses on trickery, especially in making the opponent's tactics work against them)
Love/Lust = Pink (Focuses on quick and powerful attacks (after all, sex is the root of all erotic hypnosis) but has low defensive traits and sometimes "lacks focus", causing cards to potentially fail their effects.)
And so on and so forth. And cards of a given type would often work together or enhance cards of similar types. For example:
Robotized Soldier - Silver (100 WP)
Attack: Enemy Slave loses 100 WP. Cannot attack non-Slave cards.
Ability: Robotic Army - For each Silver Slave card in your play area, gain 100 WP to this card.
Flavor text: "All must join the slave army. Resistance is futile."
I'd be absolutely thrilled to help with this project though :)
FYI, we could probably use this:
www.lackeyccg.com/ Edit: Also, what about, instead of having standard "holographic" cards for super rare cards, we have them be animated gifs where you can see stuff like spinning spiral eyes, swinging pendulums, etc?