Spi-Ky-Ro! King of Purple Dragons

This came to me as a brief idea that I just want to get out there. Please tell me what you think of it via review or PM.

Prologue

Long ago, when the Multiverse was still young, there existed a planet inhabited by sentient moles, cheetahs, apes, grublins, and dragons. But one powerful purple dragon attempted to use his power over all elemental dragon breaths to destroy the entire planet. Until a braver and even more powerful younger purple dragon locked the evil dragon away, imprisoning him within the core of the planet. . .

Now, many light-years away, on the magical flat-planet of Equestria, a young dragon named Spike unlocks the secret of the Purple Emerald Pendant. He is infused with ancient magical energies, for destiny has chosen him to defend the Multiverse from the return of the Dark Master, just as the brave purple dragon did, on the faraway planet of the Dragon Realms. . .


There, that's the premise of this story. However, I have no idea where I'm going with this, so PLEASE! HELP ME! Reviews, Private Messages, anything! Just help me to come up with some idea for this, because I'm not gonna have ponies do card games! Then again, I could somehow parody Yu-Gi-Oh's Duelist Kingdom and/or Battle Story arcs with normal battles rather than card duels. But that's gonna be tricky, so I'm still gonna need some help. So please, reviews and PMs!