Is Stone Kavu legal in Standard, Modern, and Commander?

Stone Kavu is legal in: Legacy, Vintage, Commander, Pauper.

Stone Kavu

Q: What type of card is Stone Kavu?

Stone Kavu is a Creature — Kavu. Its oracle text reads: "{R}: This creature gets +1/+0 until end of turn. {W}: This creature gets +0/+1 until end of turn. *To maintain its hide, it consumes a variety of rocks—not to mention a variety of Phyrexians.* Power/Toughness: 3/3"