Is Baru, Wurmspeaker legal in Standard, Modern, and Commander?

Baru, Wurmspeaker is legal in: Legacy, Vintage, Commander.

What type of card is Baru, Wurmspeaker?

Baru, Wurmspeaker is a Legendary Creature — Human Druid. Its oracle text reads: "Wurms you control get +2/+2 and have trample. {7}{G}, {T}: Create a 4/4 green Wurm creature token. This ability costs {X} less to activate, where X is the greatest power among Wurms you control. Power/Toughness: 3/3"