Most lords buff power and/or toughness of other elves you control, and thats the classic definition of a lord
Azula, Cunning Usurper Azula, Cunning Usurper provides through firebending, but gets the Dimir classification because the ability isn't tied to color identity
Even in a game of Commander, thisll do a lot of damage very quickly, and there are lots of ways to use those exiled cards, like Oblivion Sower, for example
At minimum it's 5 mana and an attack trigger towards the specific player, and unless your engine is churning already your Elves may well not be big enough to kill the thing you want dead, or to survive the ensuing combat
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