Spontaneous Casting

(Eberron Campaign Setting, page 61, DnD 3.5)

[General]

You can swap a prepared spell on the fly.

Prerequisite

Caster level 5th

Benefit

You can exchange a spell you have prepared for another spell on your spell list (or for wizards, out of your spellbook) of the same level.

Special

Using this ability costs 2 action points.