I think it depends on how they would RECEIVE it.
Would this person respond with offense or thanksgiving?
There are some who (for whatever reason) may take offense at this because of their own lack of understanding… you know, those who are ANTI-Catholic (again, for whatever confused reason).
Regardless, having a Mass *said *for this person’s intention is a *BEAUTIFUL *gift, and should be done whether or not you decide to give the CARD itself.