Prototype seems to function well. Nothing crashed.
The idea of a dice-mana mechanic isn't bad on its own, but just clicking on it manually to roll at the beginning of every turn is a bit of a chore. Better automate it. Maybe if you had some strategic decision made with the dice, like saving up a pool and deciding how many you roll, or having different-sized dice (like D&D does), and having to decide how much you sacrifice for mana.
Something that automatically ends your turn when you have nothing else to do wouldn't be remiss either, since the card is already drawn automatically at the beginning of every turn.
For the "Roll another dice and draw another card" spell, you should word it again to say "roll your dice again". I thought it would get me another dice to roll, though that might be just too overpowered from a balancing point of view.
Anyway, solid prototype.