Shielded Aether Thief is a uncommon Creature — Vedalken Rogue card from Aether Revolt (AER), collector number 44. Current market price: $0.21 (foil $0.33), TCGplayer market prices via Scryfall.
Flash (You may cast this spell any time you could cast an instant.) Whenever this creature blocks, you get {E} (an energy counter). {T}, Pay {E}{E}{E}: Draw a card.