The energy you pour into increasing the power of your spells feeds back upon itself in an ever-increasing cycle.
Prerequisites: Two or more metamagic feats.
Benefit: The Metamagic Vigor feat allows the use of two tactical maneuvers.
Metamagic Intensity: If you cast spells affected by the same metamagic feat in 2 consecutive rounds, you gain a +1 bonus to the second spell’s caster level.
Metamagic Versatility: If you cast spells affected by two different metamagic feats in 2 consecutive rounds, you gain a +1 bonus to the second spell’s save DC.
Special: You can’t benefit from both of these maneuvers (or either maneuver more than once) in a single round; if you are eligible to use both, choose the one you want.
Only actual metamagic feats allow this feat to function. A metamagic spell effect produced by a metamagic rod or other magic item or external device does not qualify you to use this feat.
Source: Complete Mage, page 45.