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Who is the worst champion?

I think that we can all agree these two are in the bottom 2. The only thing they have is armor, and haven't been buffed since the beginning of the game. However, which one is better? Colossus is bleed immune, but Iron Man has regen when awakened.
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So yeah, Colossus is the worst of the two but Groot and Hulkbuster are probably even worse than him.