Aethersquall Ancient is a rare Creature — Leviathan card from Kaladesh (KLD), collector number 39. Current market price: $0.24 (foil $1.10), TCGplayer market prices via Scryfall.
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.