Is Shambling Vent legal in Standard, Modern, and Commander?

Shambling Vent is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Shambling Vent?

Shambling Vent is a Land. Its oracle text reads: "Shambling Vent enters tapped.{T}: Add {W} or {B}.{1}{W}{B}: Shambling Vent becomes a 2/3 white and black Elemental creature with lifelink until end of turn. It's still a land."

Shambling Vent

Land

Shambling Vent enters tapped.<br>: Add or .<br>: Shambling Vent becomes a 2/3 white and black Elemental creature with lifelink until end of turn. It's still a land.