Is Bring Down legal in Standard, Modern, and Commander?

Bring Down is legal in: Legacy, Vintage, Commander.

Bring Down

Q: What type of card is Bring Down?

Bring Down is a Sorcery. Its oracle text reads: "Assist (Another player can pay up to {3} of this spell's cost.) Destroy target creature with power 4 or greater. *"Big, wicked, and not too smart. Poor thing never stood a chance against us, dear." —Regna, to Krav*"