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

Yavimaya Kavu is legal in: Legacy, Vintage, Commander.

Yavimaya Kavu

Q: What type of card is Yavimaya Kavu?

Yavimaya Kavu is a Creature — Kavu. Its oracle text reads: "Yavimaya Kavu's power is equal to the number of red creatures on the battlefield. Yavimaya Kavu's toughness is equal to the number of green creatures on the battlefield. *Kavu hunt prey in packs—one kavu hunts a pack of prey.* Power/Toughness: */*"