Is Calcite Snapper legal in Standard, Modern, and Commander?

Calcite Snapper is legal in: Modern, Legacy, Vintage, Commander, Pauper.

Calcite Snapper

Q: What type of card is Calcite Snapper?

Calcite Snapper is a Creature — Turtle. Its oracle text reads: "Shroud (This creature can't be the target of spells or abilities.) Landfall — Whenever a land you control enters, you may switch this creature's power and toughness until end of turn. Power/Toughness: 1/4"