Metamagic Mastery — Quicken Spell

At 20th level, you can quicken your next spell as though using the Quicken Spell feat. Quickening costs 4 daily usages of metamagic mastery. Quicken Spell: Casting a quickened spell is a swift action. You can perform another action, even casting another spell, in the same round as you cast a quickened spell. A spell whose casting time is more than 1 round or 1 full-round action cannot be quickened.