Took me some time to figure it out, but when I did, I loved the idea and I think it fits the theme perfectly. As feedback, I think a small description on the spell button itself would work better than a tooltip. Good game and idea. Congrats!
It definitely was tough squeezing in a detailed enough description into just the button text w/o making the text to small We thought of naming the spells clearer/more generic things like "Peek Card", but really liked the flavor of the more magical spell names
