Plagg, Kwami of Destruction

Flying, Indestructible, Defender
At the beginning of your upkeep, if you don't control an artifact named "Black Cat Ring," exile Plagg, Kwami of destruction. Then, if you gain control of "Black Cat Ring," you may cast this card from exile.
If you control "Black Cat Ring," each opponent loses one life at the beginning of your upkeep.
Look, I'm a kwami. I grant powers. Yours is the power of destruction. Got it? Good. And now, got anything to eat? I'm starving!