(: Add or to your mana pool.)
When Obsidian Castle enters the battlefield, sacrifice it unless you pay .
: Obsidian Castle becomes a 0/4 white and black Wizard creature with defender until end of turn. It's still a land.
: Add 
or 
to your mana pool.).
: Obsidian Castle becomes a 0/4 white and black Wizard creature with defender until end of turn. It's still a land.
