A fire spell that is an aoe, known for burning, leaving foes with a life dispel (hence burning leaves)
A spell that adds a +30 trap right BEFORE it attacks, making it scale uniquely with any other buffs or debuffs the wizard currently has.
A spell that has a +20% chance to be critical.
A life spell much like the Mirage spells, splitting healing between specific players.
A spell that does more damage based on how much current health the enemy has (If the enemy has more health, it does more damage, or maybe you could make it the other way).
A balance attack leaving enemies with three random dispels. Or maybe it could be less risky and make it so that it leaves a spiritual diffuse.
Let me know if you guys have good spell ideas, and your thoughts on these.