(: Add or to your mana pool.)
When Obsidian Den enters the battlefield, return a land you control to its owner's hand.
: Obsidian Den becomes a 0/4 white and black Rogue creature with defender until end of turn. It's still a land.
: Add 
or 
to your mana pool.)
: Obsidian Den becomes a 0/4 white and black Rogue creature with defender until end of turn. It's still a land.
