Hi, thanks for your review!
1. Hover effect is great idea, i will definetely think about it. Right now description is on the top right corner, because i didn't want to overlap it with other cards or game elements. Mb i will show it quicker
2. It was intentional, because i didn't want players to "cheat" on magnet card (to double itself), but i see, that it might be frustrating, if your cards disappeared unintentionally, i will think about it