Amareth's Mind Rummage

You dive deep into your unprepared mind in order to prepare a spell you should have. Apon casting this spell you may swap one of your prepared spells including this one for a spell in your spellbook that you have memorised at least once in the past.

At higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the extra spells you can swap out increase by 1 for each slot level above 1st.