Proteus

(Exemplars of Evil, page 26, DnD 3.5)

[General]

You are a master of masking your features behind a myriad of disguises.

Prerequisite

Spell Focus (illusion), Spellcaster Level 10th

Benefit

You can sacrifice a prepared spell to cast any lower-level illusion (glamer) spell. In addition, you can cast a prepared illusion (glamer) spell as an immediate action by sacrificing another spell of the same level.