How about our idea in Pathfinder?
Master Magic I Feat 12
Bard Cleric Druid Oracle Sorcerer Witch Wizard Metamagic
Your good at what you do! Choose a 1st level spell. Once per day, you can cast this spell without preparing this spell at your maximum spell level using the normal amount of actions required for that spell.
Master Magic II Feat 14
Bard Cleric Druid Oracle Sorcerer Witch Wizard Metamagic
Prerequisites Master Magic I
The best get better! Choose a 2nd level spell. Once per day, you can cast this spell without preparing this spell at your maximum spell level using the normal amount of actions required for that spell.
Master Magic II Feat 16
Bard Cleric Druid Oracle Sorcerer Witch Wizard Metamagic
Prerequisites Master Magic II Your the best! Choose a 3rd level spell. Once per day, you can cast this spell without preparing this spell at your maximum spell level using the normal amount of actions required for that spell.
Nice. Counter proposal, as spells uptick at odd levels, feat 1 – lvl 1 spell. Feat 2 – lvl 3 spell, Feat 3 – Lvl 5 spell.