Stomping Ground (GTC) from Gatecrash, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: David Palumbo
• Card Text:
  (Tap: Add R or G to your mana pool.)
  As Stomping Ground enters the battlefield, you may pay 2 life. If you don't, Stomping Ground enters the battlefield tapped.