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

Flowstone Kavu is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

Flowstone Kavu

Q: What type of card is Flowstone Kavu?

Flowstone Kavu is a Creature — Kavu. Its oracle text reads: "Menace (This creature can't be blocked except by two or more creatures.) {R}: This creature gets +1/-1 until end of turn. *The kavu adjusted easily to the Rathi overlay, incorporating the invasive flowstone into their own adaptable forms.* Power/Toughness: 2/3"