Is Snarling Wolf legal in Standard, Modern, and Commander?

Snarling Wolf is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

Snarling Wolf

Q: What type of card is Snarling Wolf?

Snarling Wolf is a Creature — Wolf. Its oracle text reads: "{1}{G}: This creature gets +2/+2 until end of turn. Activate only once each turn. *"Oh, thank the angels. It's not a werewolf, just a regular wo—" —Bruno, Ulvenwald guide, last words* Power/Toughness: 1/1"