Is Rain of Rust legal in Standard, Modern, and Commander?

Rain of Rust is legal in: Modern, Legacy, Vintage, Commander, Pauper.

What type of card is Rain of Rust?

Rain of Rust is an Instant. Its oracle text reads: "Choose one — • Destroy target artifact. • Destroy target land. Entwine {3}{R} (Choose both if you pay the entwine cost.) *On Mirrodin, mages who call upon the power of rust are shunned by their people and often turn mercenary to survive.*"