Caves River enters the battlefield tapped unless you pay .
: Add to your mana pool. Caves River doesn't untap during your next untap step.
: Caves River becomes a 1/1 blue and black Zombie creature with flying until end of turn. It's still a land.
.
: Add 
to your mana pool. Caves River doesn't untap during your next untap step.: Caves River becomes a 1/1 blue and black Zombie creature with flying until end of turn. It's still a land.
