Cave Ruins enters the battlefield tapped unless you sacrifice an artifact creature.
: Add to your mana pool. Cave Ruins doesn't untap during your next untap step.
, Sacrifice Cave Ruins: Cave Ruins deals 1 damage to target creature or player.
: Add 
to your mana pool. Cave Ruins doesn't untap during your next untap step., Sacrifice Cave Ruins: Cave Ruins deals 1 damage to target creature or player.
