The win conditions for these decks still come in a very wide variety
So yeah, I understand why Atraxa, Praetors' Voice is the defacto Superfriends commander for most players
Rakdos Charm is ok, you run 4 Scoozes in the MB so you're already decent against graveyard decks
Karrthus is a decent example of a high-powered legend that immediately pressures life totals, but there are cheaper examples like Maarika, Brutal GladiatorMaarika, Brutal Gladiator, Kresh the BloodbraidedKresh the Bloodbraided (who starts small but can scale absurdly in the right deck), and Coram, the Undertaker (who is on paper a little fiddly but is easy enough in the format to make gigantic)
Spending wildcards to craft cards is almost too easy
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