Is Aethersquall Ancient legal in Standard, Modern, and Commander?

Aethersquall Ancient is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

What type of card is Aethersquall Ancient?

Aethersquall Ancient is a Creature — Leviathan. Its oracle text reads: "Flying At the beginning of your upkeep, you get {E}{E}{E} (three energy counters). Pay eight {E}: Return all other creatures to their owners' hands. Activate only as a sorcery. Power/Toughness: 6/6"