Aether Poisoner (AER) from Aether Revolt, available at 401 Games Canada.

• Rarity: Common
• Finish: Normal
• Artist: Yongjae Choi
• Card Text:
  Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
  When Aether Poisoner enters the battlefield, you get EE (two energy counters).
  Whenever Aether Poisoner attacks, you may pay EE. If you do, create a 1/1 colorless Servo artifact creature token.