Three Tree City (BLB) from Bloomburrow, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Grady Frederick
• Card Text:
  As Three Tree City enters, choose a creature type.
  T: Add C.
  2, T: Choose a color. Add an amount of mana of that color equal to the number of creatures you control of the chosen type.