Is Cavernous Maw legal in Standard, Modern, and Commander?

Cavernous Maw is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Cavernous Maw

Q: What type of card is Cavernous Maw?

Cavernous Maw is a Land — Cave. Its oracle text reads: "{T}: Add {C}. {2}: This land becomes a 3/3 Elemental creature until end of turn. It's still a Cave land. Activate only if the number of other Caves you control plus the number of Cave cards in your graveyard is three or greater."

Land — Cave

: Add .

: This land becomes a 3/3 Elemental creature until end of turn. It's still a Cave land. Activate only if the number of other Caves you control plus the number of Cave cards in your graveyard is three or greater.