Is Kin-Tree Warden legal in Standard, Modern, and Commander?

Kin-Tree Warden is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

What type of card is Kin-Tree Warden?

Kin-Tree Warden is a Creature — Human Warrior. Its oracle text reads: "{2}: Regenerate this creature. Morph {G} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) *"The amber of the tree and the blood of my veins are the same."* Power/Toughness: 1/1"