True Casting(Complete Mage, p. 121)
Level: Sorcerer 1, Wizard 1, Spellthief 1,
Components: V, S,
Casting Time: 1 standard action
Duration: One spell
You focus your magic deep in your soul until it becomes a torrent that must be unleashed.
Your next single spell (if it is cast before the end of the next round) gains a +10 insight bonus on any caster level check made to overcome spell resistance.