[@Holy Grail] Perhaps a gift that makes your character able to pick up and create styles of magic more easily? I hope I am not misinterpreting the system here, but if magic is a research, or field of study, then the gift would make the research easier and the application similar to how scientists invent new kinds of machines using science. Honestly, this is mostly just what my gift is, only with magic. 

I hope you don't mind, but magic affinities seem to be more depending on how well the character understands the concepts rather than anything to do with the magic itself, as the magic only gives a medium to apply the understanding. I just think it would be difficult to truly make a gift for something that is already available to everybody without breaking the rules of magic.