Aetherstream Leopard is a common Creature — Cat card from Aether Revolt (AER), collector number 103. Current market price: $0.05 (foil $0.44), TCGplayer market prices via Scryfall.
Trample When this creature enters, you get {E} (an energy counter). Whenever this creature attacks, you may pay {E}. If you do, it gets +2/+0 until end of turn.