Source: Dragon #325
One of your metamagic feats is easier to use.
Prerequisite: Any other metamagic feat.
Benefit: Choose a metamagic feat you already have. When preparing or casting a spell modified by that feat, lower the spell-slot cost by one. You can never reduce the spell-slot cost below one level higher than the spell's actual level. For example, taking this feat for the Quicken Spell feat reduces the spell slot cost of a quickened spell from four levels higher than the spell's actual level to three levels higher than the spell's actual level.
Special: You can gain this feat multiple times. Each time you take this feat, you must choose a new metamagic feat.