It is, as advertised, a bottle of sand. It has layers of sand, all in different colours, and not even those fun bright colours of dyed sand, the only reason one would buy a bottle of sand. Why did you buy that bottle of sand, anyway? You hadn't pegged the witch selling it to be a great salesperson, you don't think. Strangely, you can't remember much of the interaction that led to you buying a literal bottle of sand. Huh.
....
Wait a moment, they must've charmed you to buy their potion! Not only is that a horrendous violation of you free will, but you didn't even get anything cool out of it, like a deadly curse or something. Nope, just-
The glass in your hands suddenly cracks, and you drop it to avoid getting injured. Sand pours out of the broken vial- much more glass then you thought would fit in there. It builds up, becoming a miniature tornado of sand. You close your eyes against the wind and the sand until it stops, and it does. And when it stops, a tall creature is standing in its place.
It seems to have features taken from a goat, a rabbit, a camel, a grouse, and possibly more creatures. It has beautiful violet coloured eyes, which are large and seem to shine with an intelligence to rival your own. With long limbs, a set of wide claws with thick pads, and a pair of cloven hooves, this creature seems perfectly adapted to striding across vast expanses of sand. Which is helpful, because golden-toned sand is constantly spilling from its horns and back with seemingly no end. Which will make cleanup a mess, but it's better than a non-magical bottle of sand, of any colour.
(This blurb got a bit lengthy, whoops! The text is just for fun, you don't have to use it for anything! I hop you enjoy your creature :) )
