Is Dimir Infiltrator legal in Standard, Modern, and Commander?

Dimir Infiltrator is legal in: Modern, Legacy, Vintage, Commander, Pauper.

What type of card is Dimir Infiltrator?

Dimir Infiltrator is a Creature — Spirit. Its oracle text reads: "This creature can't be blocked. Transmute {1}{U}{B} ({1}{U}{B}, 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.)"

Dimir Infiltrator

Creature — Spirit

This creature can't be blocked.

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.)