I think a more formal card would use the last initial, and a playful card could use either.
I have some with my first and my last initial, that I use for different things.
For a teacher, if it is a card they might make out to a student, use the last initial- since students don't use their last name. If you aren't on a first name basis with this teacher, also use the last name. Otherwise, it is up to you.
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