Is Hissing Quagmire legal in Standard, Modern, and Commander?

Hissing Quagmire is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Hissing Quagmire?

Hissing Quagmire is a Land. Its oracle text reads: "Hissing Quagmire enters tapped.{T}: Add {B} or {G}.{1}{B}{G}: Hissing Quagmire becomes a 2/2 black and green Elemental creature with deathtouch until end of turn. It's still a land."

Hissing Quagmire

Land

Hissing Quagmire enters tapped.<br>: Add or .<br>: Hissing Quagmire becomes a 2/2 black and green Elemental creature with deathtouch until end of turn. It's still a land.