well i kinda agree with you that there should be a card that does that, but what if you were fighing a boss, and you lost half of your mana,i would rather be safe and just not use it, like don't get me wrong, sometimes, i waste like 5- 10 minutes, just waiting for a good card to pop up, but if i had to waste pips for something that would endanger my wizard, than i would just rather not have it.