Is Ethereal Usher legal in Standard, Modern, and Commander?

Ethereal Usher is legal in: Modern, Legacy, Vintage, Commander.

Ethereal Usher

Q: What type of card is Ethereal Usher?

Ethereal Usher is a Creature — Spirit. Its oracle text reads: "{U}, {T}: Target creature can't be blocked this turn. Transmute {1}{U}{U} ({1}{U}{U}, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.) Power/Toughness: 2/3"

Creature — Spirit

, : Target creature can't be blocked this turn.

Transmute (, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)