Is Reef Shaman legal in Standard, Modern, and Commander?

Reef Shaman is legal in: Legacy, Vintage, Commander, Pauper.

Reef Shaman

Q: What type of card is Reef Shaman?

Reef Shaman is a Creature — Merfolk Shaman. Its oracle text reads: "{T}: Target land becomes the basic land type of your choice until end of turn. *With one gesture, she can render a thousand years of navigational charts obsolete.* Power/Toughness: 0/2"