At 20th level, your body surges with arcane power. You can add any metamagic feats that you know to your spells without increasing their casting time, although you must still expend higher-level spell slots. Whenever you use magic items that require charges, you can instead expend spell slots to power the item. For every three levels of spell slots that you expend, you consume one less charge when using a magic item that expends charges.
