Sorin looks a lot like some of the more classically designed walkers, like Chandra, Torch of Defiance or Elspeth, Knight-Errant
(It can deal excess combat damage to the player or planeswalker it's attacking.) While resolving Dire Fleet Warmonger's ability, you can't sacrifice multiple creatures to give it more than +2/+2 and trample
Kicker represents an optional additional cost
Right now I have it in so that I have something good to return with The Mending of Dominaria, but maybe a better plan is to use Bone Dragon and not The Mending of Dominaria, either just relying on Devious Cover-Up or possibly using Bone Dragon to sculpt your graveyard for Gaeas Blessing, though that sounds like the kind of late-game nonsense that will never actually come up, whereas Gaeas Blessing messing up your Bone Dragon will come up
Although Blasphemous Edict wont be able to clear the board against the most extreme go-wide decks (where wraths are often the most needed), being a sacrifice effect gets around annoying protection like Indestructible
Four copies of Force of Negation handle cascade pretty cleanly, while giving you a little extra juice in the Burn match-up