Explain to your mother that it's just a game, although if she does think it teaches witchcraft she's probably beyond the point of convincing - but it doesn't resemble witchcraft so much as it resembles a sci-fi setup with all the futuristic technologies in use as well as super-powered and cute "mutant" creatures battling, which certainly isn't witchcraft, haha. If they think you're not responsible, prove to them you are. If you're over 12, there's a very high chance you're responsible enough to handle Pokemon cards and not damage or lose them. Heck, I've been collecting Pokemon cards since I was 8, and though I've damaged a few cards in those early years, it was because I wasn't storing them properly and they would get damaged when left out, and I learned my lessons as a collector very quickly. Accidental card damage can happen to anyone, though.