Is Carnivorous Moss-Beast legal in Standard, Modern, and Commander?

Carnivorous Moss-Beast is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper.

Carnivorous Moss-Beast

Q: What type of card is Carnivorous Moss-Beast?

Carnivorous Moss-Beast is a Creature — Plant Elemental Beast. Its oracle text reads: "{5}{G}{G}: Put a +1/+1 counter on this creature. *Ranger wisdom dictates that when fleeing from a moss-beast, you must stay calm, find your bearings, and run south.* Power/Toughness: 4/5"