When Calciform Seafloor enters the battlefield, return a land you control to its owner's hand.
: Add or to your mana pool.
Sacrifice Calciform Seafloor: Add or to your mana pool.
, : Calciform Seafloor deals 1 damage to target attacking creature.
: Add 
or 
to your mana pool. or to your mana pool., : Calciform Seafloor deals 1 damage to target attacking creature.
