Unbinder's Blessing
From Compendium of Worldly Lore
Needs review
Source: Quintessential Elf 2
Description: You are particularly adept at unweaving another's magic
Prerequisites: Improved Counterspell, Words of Unbinding, 10 levels of arcane spells
So long as you maintain more than 10 levels of available arcane spells you may use any spell of greater level as a counterspell. If casting the counterspell would drop you below 10 levels of stored energy, you may not use this feat.
Normal
You may use a spell for the same school of greater level with Improved Counterspell. If you do not have Improved Counterspell you must use the same spell or a spell specifically designed to counter the target spell in a counterspell attempt.