Say /co/, can you help a nigga out? I recall an animated movie

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Say /co/, can you help a nigga out? I recall an animated movie as a kid that was pretty cool from what I remember. Setting was some kind of magic circus and the circus leader was the villain. I don't quite recall what they were doing at the circus but it was probably some shadow realm yugioh level shit. The good guys included creatures taken from different time eras for some reason and I distinctly remember one was a T-rex.

There was this scene at the end where the villain was like "Please don't leave me alone". Ringing any bells here? I know it sounds like some fevered dream but I think it isn't. Saw it on CN.