I used to make TCGs as a kid all the time, I'd make like a 50 card set then photo copy them and give them to all my friends, we'd build decks, and we'd play each other. In late highschool I made a pretty unique card game that I never printed, only made in notepad form, that was based off a story I had written. In early college I programmed a computer game, it was basically an adventure game (think phoenix wright, monkey island, sam and max, etc) but I had other mini games in it, one of them introduced in the second chapter, was a tcg card game, to advance to the next chapter you had to buy an item and you could win money via playing the card game. You got a weak starter but could buy packs of cards to help you build a stronger deck and fight stronger opponents who gave bigger money payouts thus getting the money faster, that was the only part where you ever HAD to play the card game at all, after that it only showed up as something extra you could do to get extra non-essential items or features unlocked since I know not everyone cares for card games and I didn't want to make it the focus of the game.
The bunnies of Lavato have special abilities, like 'Action Skill: Make Carrot Disappear.'