Calciform Catacomb enters the battlefield tapped.
: Add or to your mana pool.
Sacrifice Calciform Catacomb: Add or to your mana pool.
: Calciform Catacomb becomes a 2/2 black Horror creature until end of turn. It's still a land.
: Add 
or 
to your mana pool. or to your mana pool.
: Calciform Catacomb becomes a 2/2 black Horror creature until end of turn. It's still a land.
