Is Riptide Shapeshifter legal in Standard, Modern, and Commander?

Riptide Shapeshifter is legal in: Legacy, Vintage, Commander.

Riptide Shapeshifter

Q: What type of card is Riptide Shapeshifter?

Riptide Shapeshifter is a Creature — Shapeshifter. Its oracle text reads: "{2}{U}{U}, Sacrifice this creature: Choose a creature type. Reveal cards from the top of your library until you reveal a creature card of that type. Put that card onto the battlefield and shuffle the rest into your library. Power/Toughness: 3/3"

Creature — Shapeshifter

, Sacrifice this creature: Choose a creature type. Reveal cards from the top of your library until you reveal a creature card of that type. Put that card onto the battlefield and shuffle the rest into your library.