Mastery of Day and Night

(Player's Guide to Eberron, page 125, DnD 3.5)

[General]

You have learned to calculate the precise locations of Irian and Mabar at any given time, and to use that knowledge to enhance your manipulation of positive and negative energy.

Prerequisite

Maximize Spell, Knowledge (the planes) 2 ranks, Spellcraft 6 ranks

Benefit

You can spontaneously apply the effect of the Maximize Spell metamagic feat to any cure or inflict spell you cast. Doing this has no effect on the spell's level or casting time.