MAGIC: THE GATHERING
Raging Ravine enters the battlefield tapped.
: Add or to your mana pool.
: 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.
Arguably the best of the Worldwake "manlands", Raging Ravine often grows out of control in a hurry, getting bigger than a Lightning Bolt can handle after its first trigger resolves.