Spontaneous Wizard Magic

Previous post about clerics here.

So, if clerics can benefit from some spontaneous choices, couldn't wizards do the same?  Maybe.  I'm willing to give it a try.

Seems to me that if wizards didn't feel like they always had to have Fireball or Sleep memorized, they might just memorize Gust of Wind or Mount.  

My thought was that (whether you use Schools of Magic or not) wizards could attach themselves to a school and in doing so, they would get access to certain spells to use "in exchange" for any spell they have memorized.

Of course, you can always exchange a higher level spell for a lower level spell.

I've tried to match a "theme" to the wizard school.  I think these groupings have a lot of potential.  I also think that Invocation/Evocation will be a popular choice.  :)

School	Level 1	Level 2	Level 3	Level 4	Level 5
Abjuration	Protection from Evil	Protection from Cantrips	Dispel Magic	Minor Globe	Dismissal
Alteration	Feather Fall	Levitate	Fly	Dimension Door	Teleport
Conjuration/Summoning	Mount	Summon Swarm	Monster Summoning 1	Black Tentacles	Faithful Hound
Enchantment/Charm	Charm Person	Forget	Suggestion	Confusion	Feeblemind
Illusion/Phantasm	Phantasmal Force	Invisibility	Spectral Force	Minor Creation	Demi-Shadow Monsters
Invocation/Evocation	Magic Missile	Web	Fireball	Ice Storm	Wall of Stone
Divination	Detect Magic	ESP	Clairvoyance	Magic Mirror	Contact Other Plane
Necromancy	Chill Touch	Spectral Hand	Vampiric Touch	Contagion	Animate Dead

Created with the HTML Table Generator

As always, YMMV.  I have not playtested this yet, but I'm planning on it.

EDIT: I'm going to make wizards roll INT or less on d20 to change a spell on the fly.  If they want to change it in memory, they can do that over the course of several turns -- no problem.  Clerics (because of "divine favor" make their swaps at will.