You are attuned to magical forces to a high extent. You can intuitively feel the flows and nature of magic, and you can sometimes have flashes of inspiration that let you figure things out or invent a new spell. Eventually, you will be able to copy any spell you see and send it back to the caster improved. When working with magic you will find that everything just comes easier to you, to the point that you are able to just will your magic together in hopes of a certain effect and have it succeed. Your spells will passively refine themselves to be more in line with what you want. The limitations of magic break down in front of your very eyes when researching for long enough.
Return to Sender
You are able to identify spells by feeling alone, allowing you to sense an opponent's spell before it has even been cast and form a counterspell with enough practice. Flashes of insight can occur with a much higher frequency, always in a subject, you would appreciate. With enough practice, you could even break down a spell before it has been fully formed.
Analysis
You can gain a mental image of an object you lay hands on down to the molecular level. You replicate anything you scan with ease, no matter how magically complicated it is. Your contingency spells are able to gain a slice of your mind no matter the conditions, allowing you to no longer have to worry about limited activating conditions. Your entire body acts as a magnifier for your Mana sense, increasing your detection radius by a magnitude.
Whisper
Your Cores will constantly grant low levels of insight without conscious thought or direction, this insight is always in an area of magic you would appreciate. Each specialized Core grants you an incredible affinity to whatever magic is chosen, a Core specialized in Spatial Magic could have you developing a fine level of spatial awareness, and a Core specialized in Book Magic could have you develop an intuition toward sources of important arcane knowledge. These affinities are not static things, growing as you use and experience more.
Substitute
You are able to identify all sorts of magical materials through feel alone, be they metals, plants, or mixtures. With enough practice, you could even replace materials with your own Mana in their place. Making a sword with no forge, replacing a rare ingredient with your own magic to form a potion, the possibilities are endless. Your magic will remember all of the forms it has taken, only having to achieve a form once in order for you to replicate it again with ease, no matter the initial challenge.