Aether Meltdown is a uncommon Enchantment — Aura card from Kaladesh (KLD), collector number 36. Current market price: $0.26 (foil $0.41), TCGplayer market prices via Scryfall.
Flash (You may cast this spell any time you could cast an instant.) Enchant creature or Vehicle When this Aura enters, you get {E}{E} (two energy counters). Enchanted creature gets -4/-0.