If it didn't costed 1 to sack, I would brew this with Aristocrats.
If it wasn't CMC 3, I would brew this in Vampires.
As-is, it's cool but I'm not sold. Most relevant Tribal decks already have better Lords in the 3 CMC slot or even lower, while Aristocrats definitely want something like this and could even jump through the hoops of going Tribal if needed, but don't want to pay for its sack effects. Still pretty relevant for Commander, I guess.