#200: Final Riddle!

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Answer to #199: The horse. All horses have two right hooves apparently.
(Dedicated to BooBooKitty_)

I am, but I am not
My identity is not from my name
I am double one hundred
But a millennium just the same
I am possible but impossible
I challenge and I test
The answer is plausible
I pledge to those knowing best
What am I?
[Slide for answer]

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