Whenever Timberline Barrens becomes tapped, it deals 1 damage to you. : Add  to your mana pool. Activate this ability only if you control a Forest. : Add  to your mana pool. Activate this ability only if you control a Swamp. : Timberline Barrens becomes a 2/2 black and green Squirrel creature with trample until end of turn. It's still a land.