Call for Unity (Foil) (AER) from Aether Revolt, available at 401 Games Canada.

• Rarity: Rare
• Finish: Foil
• Artist: John Severin Brassell
• Card Text:
  Revolt — At the beginning of your end step, if a permanent you controlled left the battlefield this turn, put a unity counter on Call for Unity.
  Creatures you control get +1/+1 for each unity counter on Call for Unity.