Maxperson
Morkus from Orkus
Counterspell ends up being common as spit once you hit 5th level. Silence is more situational, but not rare and anti-magic is hardly ever encountered.I don't see a thematical difference at all. And only a very minor mechanical one that you could go several levels without ever coming up.
I'd love something like that, but tie it to the subclass or deity/ideal. Not all of the smite types fit all subclasses/gods.As a Bonus Action, which you take immediately after hitting a target with a melee weapon or an Unarmed Strike, you can expend a spell slot to use add one of the following extra effects to your attack. You gain additional options at higher level.
Divine: deal 1d8 extra radiant damage, plus 1d8 per spell slot level spent. If the target is a fiend or undead, increase it by another 1d8
Thunder: deal 1d6 extra thunder damage, plus 1d8 per spell slot level spent. And push the target 10'.