Merfolk Cavern enters the battlefield tapped.
: Add to your mana pool. Return Merfolk Cavern to its owner's hand.
, , Sacrifice Merfolk Cavern: Target creature gets -2/-2 until end of turn.
: Add 
to your mana pool. Return Merfolk Cavern to its owner's hand., , Sacrifice Merfolk Cavern: Target creature gets -2/-2 until end of turn.
