Is Volrath, the Shapestealer legal in Standard, Modern, and Commander?

Volrath, the Shapestealer is legal in: Legacy, Vintage, Commander.

Volrath, the Shapestealer

Q: What type of card is Volrath, the Shapestealer?

Volrath, the Shapestealer is a Legendary Creature — Phyrexian Shapeshifter. Its oracle text reads: "At the beginning of combat on your turn, put a -1/-1 counter on up to one target creature. {1}: Until your next turn, Volrath becomes a copy of target creature with a counter on it, except it's 7/5 and it has this ability."