(: Add or to your mana pool.)
Scab-Cavern enters the battlefield tapped.
: Scab-Cavern becomes a 2/1 red and black Giant creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.): Scab-Cavern becomes a 2/1 red and black Giant creature until end of turn. It's still a land.
