Twincast

[What's in the box?]

I started developing a similar system but with multiple full caster spell lists it seemed to favor white/black (which makes sense given the origin) and it left the other casting classes VERY limited (Blue, Time, Summon, Geo, Illusion, Necro, etc.)

and

I didn't want the possibility of a single person doing Twin magic on their own. Which can happen if you are just pulling multiple spell effects (it would be tricky and Time Magic/Metamagic would likely factor in).