On one hand, that cast trigger means the first nonland permanent will be converted into a Powerstone no matter what. On the other hand, that means general blink and reanimator shenanigans (like that unearth) don't work on this. Not like you'd mind as this giant thing smashes through your opponent's board over and over again.
Even funner when Karn, the Great Creator tutors for this guy so your opponent can't activate their Powerstones. (I have to admit that Powerstones suck in my Modern Indomitable Creativity deck, a deck that will happily use any artifact tokens it can get.)
Tron? I could actually see it. This or Ugin in the side depending on your meta. Idk, it's not the most exciting Tron card from this set for sure, but it's not nothing. That's a beast of an attack trigger to be backed by that much trample
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Project Booster Fun makes it less fun to open a booster.