Would it help if we had more masteries that would allow for champion synergy?

For example, a mastery that adds poison damage to your kit so you have synergy with Cassiopeia.

Or something like Thunderlords degree but with knock-up instead of damage so you have synergy with Yasuo. (please don't hate me)

Or adding the Chilled debuff somehow for synergy with Anivia so she can E without needing her own spells.

Would this be a good idea? Or would it just end up being useless or broken?