Is Sengir Nosferatu legal in Standard, Modern, and Commander?

Sengir Nosferatu is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Sengir Nosferatu?

Sengir Nosferatu is a Creature — Vampire. Its oracle text reads: "Flying {1}{B}, Exile this creature: Create a 1/2 black Bat creature token with flying. It has "{1}{B}, Sacrifice this token: Return an exiled card named Sengir Nosferatu to the battlefield under its owner's control." Power/Toughness: 4/4"

Sengir Nosferatu

Creature — Vampire

Flying

, Exile this creature: Create a 1/2 black Bat creature token with flying. It has ", Sacrifice this token: Return an exiled card named Sengir Nosferatu to the battlefield under its owner's control."