A crossover of Cataclysm: Dark Days ahead and MLP...figured I should try my hand at making a story like that.

When duel monsters is created in Equestria, what happens when powerful cards known as Shadow Cards come out and bring the worst out of a pony. Can these corrupted ponies be stopped?

A Fan story of what Doctor Whooves did during the Fall of Equestria as he tries to rescue his love Derpy.