Battle Mage (3.5e Feat)
From D&D Wiki
Battle Mage [General, Fighter]
You are an experienced battle mage, skilled not only at defending yourself while casting spells against your opponents, but in maneuvering the battlefield as you do so.
Prerequisite: Concentration 12+ ranks, Combat Casting, Combat Reflexes
Benefit: You no longer provoke an attack of opportunity when casting a spell, even if your opponent possess feats such as Mage Slayer or Spellcasting Harrier. You do not need to declare that you are casting defensively in order to gain this benefit. Furthermore, you can make a special Concentration check (DC 20 + spell level) when casting a spell. If the check succeeds, you can cast a spell with a casting time of 1 standard action or less and move up to your speed as a single standard action. If the check fails, the spell fails but you may still move as part of the action.
Normal: You cannot cast a spell and move at the same time, and if you fail a Concentration check to cast defensively, you provoke attacks of opportunity.
Special: You must be able to cast abjuration spells in order to benefit from this feat.