I got the idea after listening to the song this story name sake is from and some other elements similar.
Mares and gentlecolts
Foals and ghouls!
Step right up!
Behind this curtain lies a ghastly concoction of Delight, Horror, Fantasy and terror.
Your every wish is our command!
Your every whimsical desire brought to life
But I'm warning you, there's always a price!
Welcome to the greatest show unearthed!
Oh.
The first thing that came to mind was the Dark Carnival from Insane Clown Posse
9312448
can see why you would think that but it's really from a dueo called Creature feature.
So far this story seems to be a hit and a miss since it looks like this ones equally liked and disliked.