If youre going for pure flavor, the other versions of The Master are mostly in Dimir and Rakdos colors, so you could run them all here, in theory
You can even mutate right on top of your walls, which could be useful on ones like Wall of Mulch that sacrifice themselves or other walls to get Nethroi back in the command zone to start reanimating walls all over again
Putting aside the extra turn negation, this is Mangara, the Diplomat PLUS a draw whenever an opponent draws their second card each turn
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Ultimately, Scavenged Brawler is on the high end of the mana curve for what Skullbriar wants to be doing, but the amount of value it brings to the table is more than worth it.