(: Add or to your mana pool.)
When Darkslick Karst enters the battlefield, sacrifice it unless you pay .
: Darkslick Karst becomes a 2/2 black Rat creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.).
: Darkslick Karst becomes a 2/2 black Rat creature until end of turn. It's still a land.
