Spell Creation

I just thought of this cool spell idea. What if supercell were to release a a building upgrade to the spell factory which would allow you create a spell. Not just any spell though, this spell is completely different in that which you can have a bit of each spell in it(lighting, heal! rage, etc). Now it would be special because by creating it the user would be able to control what amount of each spell goes into making this special one. There fore creating different spell combinations. Example 15% healing and 20% dmg & %10 speed increase. This is just off the top of my head but imagine the possibility sand new attack strategies hat could be created by this new spell? Now the only thing is that I can imagine that adding this new thing to the game would be difficult because it would allow users to alter the stats for this spell. In addition to creating this spell, only one spell can be used to make this so you could only use one heal,rage, and freeze to make. You can not use two of the same spells to create it. And the price of the spell combination increases the more spells you use. The combination spell can be unlocked once you have more then one spell available in your spell factory to create. And once you unlock a new spell after upgrading, that spell can now be used in the combination spell creation.
Just a cool idea I thought of while waiting for my troops to finish cooking. Please respond!