Raging Ravine (WWK) from Worldwake, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Todd Lockwood
• Card Text:
  Raging Ravine enters the battlefield tapped.
  T: Add R or G to your mana pool.
  2RG: Until end of turn, Raging Ravine becomes a 3/3 red and green Elemental creature with Whenever this creature attacks, put a +1/+1 counter on it. It's still a land.