Artifacts you control have hexproof.
At the beginning of your upkeep, if you control the artifact with the highest converted mana cost or tied for the highest converted mana cost, draw a card.

Flash (You may cast this spell any time you could cast an instant.)
Enchant creature or Vehicle
When Aether Meltdown enters the battlefield, you get {E}{E} (two energy counters).
Enchanted permanent gets -4/-0.