Is Splinterfright legal in Standard, Modern, and Commander?

Splinterfright is legal in: Modern, Legacy, Vintage, Commander.

Splinterfright

Q: What type of card is Splinterfright?

Splinterfright is a Creature — Elemental. Its oracle text reads: "Trample Splinterfright's power and toughness are each equal to the number of creature cards in your graveyard. At the beginning of your upkeep, mill two cards. (Put the top two cards of your library into your graveyard.)"