Treetop Village (ULG) from Urza's Legacy, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Anthony S. Waters
• Card Text:
  Treetop Village comes into play tapped.
  T: Add one green mana to your mana pool.
  1G: Treetop Village becomes a 3/3 green creature with trample until end of turn. This creature still counts as a land.