"I believe many worlds will bow to Phyrexia. Mirrodin is merely the first."
—Sheoldred, Whispering One
In short, I have been EVIL lately.
What happens when you cross MLP:FiM's changlings with Magic:The Gathering's New Phyrexia?
Simple; you get Chrysalis contaminated with Phyrexian oil. >XD
End of story; the Changlings already look like something that clamored their way up out of Phyrexia's specimen vats. I figured I'd just go ahead and mix the two together to finalize it.
It wouldn't surprise me in the least if someone who worked on MLP played Magic:The Gathering.