Has Menace and the new Improvise mechanic, which functions very similar to Convoke
Not all decks want them, but when put in the right deck, theres a good chance either one of these will be the best card in your 99
It means no matter how many times your opponents deal with your commander, it's always a threat
Sephiroth, the Savior (Atraxa, Grand Unifier) Atraxa, Grand Unifier decks tend to be flicker soup exploiting the obscenely powerful enters ability on their commander
Im not sure pretty awesome is better than Ulamog, the Ceaseless Hunger, which is basically KO on cast against a lot of things, but Kozilek absolutely closes the door in a lot of spots where Ulamog might let them have the nuts to win
While not the flashiest of plays, it's a good early creature that sets up some powerful cards down the line