So magical beings, are now vulnerable to anti-magic at a biological level? Not an interpretation I think that would get much mileage, but you are free to have it.
Since you seem passionate about this, I would encourage you to write up a complete example of your "Elf" which covers
High, Drow, Wood, and creates a system of Culture (capital C) which we know doesn't exist today in 5e, as we only have Species, Class, and Background and Feats.
I would anticipate it would be the following rules objects, but maybe you think to combine Culture and Background?
Species
Class
Culture
Background
Feats
I'm not sure Wizards is interested in sticking their hands in the fire of assigning rules to 'culture' (lower case c) but who knows, they have changed gears a number of times in the edition already.