Your name is Anonymous, the first(and only) Human in Equestria, and everything was going great for you.
A nice job helping out on Applejack's farm, beautiful house, and even a generous stipend from Princess Celestia on account of your Diplomatic Representation of Humanity. Yes, life was swell...
Until a purple horse invades your privacy and discovers a buried relic of a bygone era:
Your Magic cards. All hell broke loose after that.
(Based on true events between me and a few friends on Game Night.) Full Disclosure: there will be swearing, kicking, screaming, and yes, even a table flip.