It’s blatantly cosmic for very obvious reasons, worst class I think is either skill or mutant leaning towards mutant. Cosmic champs are for buffs and raw damage. Science champs for utility and debuffs with the odd pure damage champ like spot. Skill is like evade counters, bleed and uhh kinda damage? Tech is power drain armour ups etc. Mystic is power steal, nullify. Mutant is prowess which is tied to specials which is the worst thing about them, you dont have a special every second like you can a basic attack meaning theyre usually slower than any other champ in bgs. Exceptions being archangel and kitty (sometimes).
Cosmic is top heavy and has the best champs of the bunch, but I think science has more reach now. Titania, Hulk, Cassie, Spot, Scorp, Torch, Photon, Silk, Ibom, Spidey 2099, Joe, Overseer, etc. I think Cosmic drops off significantly once you leave the top class. The S-tiers are some of the best in game (CGR, Hulkling, Gal, Herc) the A-tiers are good (Knull, Hype, Adam to name a few) and after that the quality of the champs is uhhh all over the place
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It's a small class, but they're all winners 😉
Maestro
The Collector
The Grandmaster
Nameless Thanos
Lil' Steve