So maybe we have a different perspective on tomorrow, but I actually have a life away from this computer, unlike somebody. So after some brainstorming, I finally came up with an idea.
While I was playing Chrono Trigger I came up with a magic quest idea based on … Chrono Trigger. In Chrono Trigger, two or three characters can combine their attacks to form Dual or Triple Techs.

So I simplified the spell list into this:

Pick two:
Fireball 1 Bolt/Unlimited
Lightning Bolt 1 Bolt/Unlimited
Iceball 1 Bolt/Unlimited
Acid Bolt 1 Bolt/Unlimited
Magic Bolt 1 Bolt/Unlimited

Pick two:
Hold Person Unlimited
Wounding Unlimited
Heal Unlimited
Mend Unlimited

So an example is that one person with Fireball and one with Wounding would be able to cast it on a weapon, creating a Fire Sword or a Cauterizing Sword, which prevents wounds inflicted by this sword from being healed.
I made an entire list of this, but I am feeling too lazy to post it now. Rest assured you won’t have to wait till june before hearing the melodius sound of my voice, or whatever.