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

• Rarity: Uncommon
• Finish: Normal
• Artist: Darek Zabrocki
• Card Text:
  Revolt — At the beginning of your end step, if a permanent you controlled left the battlefield this turn, create a 1/1 colorless Servo artifact creature token.
  1, Sacrifice a creature: Scry 1.