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Master of Spellcasting (3.5e Feat)
From D&D Wiki
Master of Spellcasting [General]
Prerequisite: Ability to cast 1st level Arcane or Divine spells.
Benefit: You gain a +4 bonus to Caster Level checks to cast a spell when using the Spellcasting variant.
Special: This feat may only be used when using the Spellcasting variant.