4bbLegendary Creature — Alicorn

Flying

As long as it’s nighttime, Nightmare Moon gets +2/+2 and has menace.

6: Transform Nightmare Moon. Anypony may activate this ability or help pay the cost. When they do, they become your friend

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Princess Luna
Legendary Creature Alicorn
Flying
When this creature transforms into Princess Luna, choose up to six cards you own from outside the game with a moon in their art, then exile those cards. As long as those cards remain exiled, you may cast them, and your friends may cast them with your permission. (Gifts are appreciated.)

“The night… will last…forever!”