Methodical Magical Methods

Your spellcasting methods require a rigid posture that makes you vulnerable to your foes while casting.
Prerequisite: Ability to cast spells.
Effect: You are considered flat-footed with an effective Dexterity of 0 (-5 to AC) on any round in which you cast a spell. You may not cast spells defensively.
Suggested Class/Race: Wizard
Source: Dragon Magazine #333 (Class Acts – Flaws For Wizards)