Bloodline Conduit 
Feat 20MetamagicSorcererSource Core Rulebook pg. 201 2.0Frequency once per minute
Your inborn magical nature lets you redirect ambient energies to fuel your spells. If your next action is to Cast a Spell of 5th level or lower that has no duration, you don’t expend the spell’s slot when you cast it.
Traits
Metamagic: Actions with the metamagic trait, usually from metamagic feats, tweak the properties of your spells. You must use a metamagic action directly before Casting the Spell you want to alter. If you use any action (including free actions and reactions) other than Cast a Spell directly after, you waste the benefits of the metamagic action. Any additional effects added by a metamagic action are part of the spell’s effect, not of the metamagic action itself.