Is Thornling legal in Standard, Modern, and Commander?

Thornling is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Thornling?

Thornling is a Creature — Elemental Shapeshifter. Its oracle text reads: "{G}: This creature gains haste until end of turn. {G}: This creature gains trample until end of turn. {G}: This creature gains indestructible until end of turn. {1}: This creature gets +1/-1 until end of turn. {1}: This creature gets -1/+1 until end of turn. Power/Toughness: 4/4"