Is Cresting Mosasaurus legal in Standard, Modern, and Commander?

Cresting Mosasaurus is legal in: Legacy, Vintage, Commander.

Cresting Mosasaurus

Q: What type of card is Cresting Mosasaurus?

Cresting Mosasaurus is a Creature — Dinosaur. Its oracle text reads: "Emerge {6}{U} (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value.) When this creature enters, if you cast it, return each non-Dinosaur creature to its owner's hand."