(: Add or to your mana pool.)
When Sunken Cavern enters the battlefield, sacrifice it unless you pay .
: Sunken Cavern becomes a 2/1 blue and black Fish creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.).: Sunken Cavern becomes a 2/1 blue and black Fish creature until end of turn. It's still a land.
