I was actually writing the story for a game one of my friends was making, but that fell through. He'd been recently laid-off, and was creating it in his abundant spare time, but then he got hired again. He's still using it as a back-up, in case the new job doesn't work out, but I don't see us resuming that project for at least another couple of years.
I've always been fascinated with the concept of playing a card game in a way that affects some kind of play-board. Playing your card summons your minion onto a board, and you manipulate what the minion does by moving the card, or whatever. When I was young, I used to think that it'd be awesome to have some form holographic game board linked up to the cards, but that's really not going to happen with current technology.
If I had infinite resources to create a game of my choosing, it'd be some kind of Frankenstein's monster mash-up of StarCraft, XCOM, and Hearthstone. You'd pick from a selection of classes/races/heroes (whichever idea ends up working best). You'd assemble a deck comprised of structures and units, with structures allowing you to play a more 'macro' game by creating units over turns throughout the course of a match, giving upgrades, or unlocking bigger units/structures for later.
It'd be turn based, as I alluded to just before. You'd play on randomized, grid like maps with terrains that function differently and force you to use different strategies; for example, a battlefield set in a jungle might favour flying units, where a desert battlefield would favour land-based units.
The amount of stuff you could play on a turn would be limited by your resources, which would increase as the game went on and you harvested more. I'd even create some kind of wild-card function, allowing you to trade cards slots in your deck for resources at the start of the game, or vice-versa, or whatever else I decided would be cool.
I'd also try to keep card-draw options as open as possible - I'd prefer for players not to have their strategies crippled on the first turn by failing to draw one of the cards they needed to start the game off.
Ideally the art style would be 2D, with units from a smattering of sci-fi, fantasy, and mythical tropes. One class might focus on Norse mythology, another on futuristic, alien technology, and still another using the inhabitants of a dwarven kingdom.
It wouldn't even be that difficult to create a single player campaign; with lots of warring factions, getting the AI up to a decent skill level would probably be more difficult than creating a story.
Fuck me typing this all out has made me REALLY want to play this game.