Just another Ka-Zar build and another Ka-Zar deck that runs Zabu...
My take is Bast obviously does well in this deck, like other decks:
if you Bast Nebula, her effect has a bit of a nudge and you can make her bigger faster. Same with getting an early boost onto Sunspot or really any of the other 1 drops this build provides (except M'Baku...you don't want to draw M'Baku, but if you do, 3 power helps)
With Squirrel Girl and Shanna in the deck, I felt adding Dazzler for tech was an interesting idea...of course you don't need to play her, but hey! an easy +6 power could do a lot of damage in this build.
I don't know why War Machine has an Ka-Zar's ability, but honestly you could run him, but I think the obvious play is Mystique over War Machine as Mystique is less in cost to play if you don't have Zabu out, so you can play more 1 costs, if need be...but I have War Machine, just as a newer card, and to slow down the swarming, as this build looks like it can crowd pretty fast. But if you do have Zabu, a two 2 drop Ka-Zars is pretty on point here.