(: Add or to your mana pool.)
When Timberland Cavern enters the battlefield, return a land you control to its owner's hand.
: Timberland Cavern becomes a 2/1 green and black Leech creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.): Timberland Cavern becomes a 2/1 green and black Leech creature until end of turn. It's still a land.
