Is Circling Vultures legal in Standard, Modern, and Commander?

Circling Vultures is legal in: Legacy, Vintage, Commander.

Circling Vultures

Q: What type of card is Circling Vultures?

Circling Vultures is a Creature — Bird. Its oracle text reads: "Flying You may discard this card any time you could cast an instant. At the beginning of your upkeep, sacrifice this creature unless you exile the top creature card of your graveyard."