This was a really neat idea. I really liked the strategic aspect of deciding which spells to use at what times and having to conserve mana. The not getting caught part was good flavor, but even without that, the spells just added a bit of a deductive reasoning aspect to the card game that was a lot of fun! It reminded me of how when playing MTG you need to hold cards back and try to predict your opponents moves so you can make sure your play is optimal for the turn. I think evolving that concept could make for a really fun and unique card type game!