Improved Metaffinity

 
Prerequisite(s): : Ability to cast Arcane spells without preparation (like a Bard or Sorcerer), Metaffinity
 
Benefit: This feat is an expanded version of Metaffinity. Despite the fact that you do not prepare spells in advance, you can pay for metamagic effects by using extra levels worth of spells instead of inflating the level of the spell being augmented. Additionally, doing this requires you to use up two slots for the spell you are casting instead of one.
 
Special: You may use any combination of spell-level slots to pay for metamagic effects so long as their cumulative value equals the total level increases for the applied metamagic feats (including Metaffinity, if you are using it to avoid increasing the spell’s casting time). 0th-level spells count as one-half of a spell level. Even with Improved Metaffinity, no metamagic feat can be applied to a spell if it would normally make it require higher than a 9th-level spell slot.
 
Source: Mongoose Ultimate Feats