(: Add or to your mana pool.)
Seafloor Ruins enters the battlefield tapped.
, , Sacrifice Seafloor Ruins: Return target creature you control to its owner's hand.
, , Sacrifice Seafloor Ruins: Put a -1/-1 counter on target creature.
: Add 
or 
to your mana pool.), , Sacrifice Seafloor Ruins: Return target creature you control to its owner's hand., , Sacrifice Seafloor Ruins: Put a -1/-1 counter on target creature.
