Is Forum Familiar legal in Standard, Modern, and Commander?

Forum Familiar is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Forum Familiar

Q: What type of card is Forum Familiar?

Forum Familiar is a Creature — Cat. Its oracle text reads: "Disguise {1}{W} (You may cast this card face down for {3} as a 2/2 creature with ward {2}. Turn it face up any time for its disguise cost.) When this creature is turned face up, return another target permanent you control to its owner's hand and put a +1/+1 counter on this creature."