There is no real "best champion" per say because each champion fulfills a diffrent spot in your roster and every champion has its weak matchups. My top 4 are Quake, Ghost and Aegon and Doom
i would say there isn't one. Maybe back before the v12 update Scarlet Witch or Doctor Strange was probably the best and i would even say when Blade came out he was the best champ but now there are so many things to do and so many different difficult quest that there is no one champ who excels in all of them. For instance Sentinel exceeds in variant 2 but i wouldn't bring him in for war as an attacker. There are way better attackers. So it all depends on what your doing and your level.
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1.Nerfman
2. The Giant Spender
3. Glitches, the Background Lagger
The Game Crasher