Is Plagon, Lord of the Beach legal in Standard, Modern, and Commander?

Plagon, Lord of the Beach is legal in: Legacy, Vintage, Commander, Historic.

What type of card is Plagon, Lord of the Beach?

Plagon, Lord of the Beach is a Legendary Creature — Starfish Wizard. Its oracle text reads: "When Plagon enters, draw a card for each creature you control with toughness greater than its power. {W/U}: Target creature you control assigns combat damage equal to its toughness rather than its power this turn. *"No more lurking in the shallows. We ride!"* Power/Toughness: 0/3"