You have watched the naturally gifted manipulate the flow of the Weave for many years, earning you a familiarity with it. While you have no control over some parts of it, you can mimic the ways others manipulate it. 

Mimicry Specialization

Choose a spellcaster class for this feature. Your feat options will be influenced by this choice.

Mimic Weave

Once per long rest, you may cast a spell from the spell list of the class you chose when taking this feat. You may cast any spell from that list, as long as you meet the requirements to cast it (Spell slot level, Material, etc.). To cast this spell, you spend a spell slot of the equivalent level of the spell you cast, and you need to succeed a Performance check equal to your spell save DC. If you fail, you cast a random spell of the same level that you have prepared / know. Roll a dice to check which spell you cast, but the target of the spell remains the same.