Why the hell is vayne such a safe champion

first off vaynes passive is one of the main things that makes vayne so fucking busted. Move speed towards enemy champions means she can just endlessly chase you down meaning that any fight is always in her favor. Secondly if vayne wants to get out she can condem and tumble the opposite direction third when vayne wants to act cool and pretend to outplay you she ults and GOES FUCKING INVISIBLE. What the serious fuck is this shit?
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