Is Duskmantle Prowler legal in Standard, Modern, and Commander?

Duskmantle Prowler is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Duskmantle Prowler?

Duskmantle Prowler is a Creature — Vampire Rogue. Its oracle text reads: "Haste (This creature can attack and {T} as soon as it comes under your control.) Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)"