Is Rocky Tar Pit legal in Standard, Modern, and Commander?

Rocky Tar Pit is legal in: Legacy, Vintage, Commander.

What type of card is Rocky Tar Pit?

Rocky Tar Pit is a Land. Its oracle text reads: "Rocky Tar Pit enters tapped.{T}, Sacrifice Rocky Tar Pit: Search your library for a Swamp or Mountain card, put it onto the battlefield, then shuffle."

Rocky Tar Pit

Land

Rocky Tar Pit enters tapped.<br>, Sacrifice Rocky Tar Pit: Search your library for a Swamp or Mountain card, put it onto the battlefield, then shuffle.