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With a solid HP of 250, Sleighfly ex is in the middle of the HP rating of Pokemon ex from Forces of Time

Mega Evolution fans

Making a wish on a shooting star that very may well contain other Cleffas and Clefairies and Clefables traveling to distant worlds

It would still be broken

And while theres no place for it in modern decks (if you really want to gain life per turn, there are better ways to do it), its an interesting bit of MTG history behind it so much so that Wizards reprinted it in the Brothers War: Retro Artifacts set

It's as simple as triggering landfall, one of the most exploitable abilities in all of Magic