What morphing is that it'll change how the spell will react now when you use it. Say you have just a normal slash ability. You can morph it to maybe now do frontal cone damage to all enemies in front of you instead of just the one target. Or a fireball now being able to explode and adding damage-over-time effect to all baddies in a 5 yard radius of the initial explosion.
It's a great idea and can't wait to see all the different ways you'll be able to change the spells around.