When Arid Seafloor enters the battlefield, return a land you control to its owner's hand.
: Add or to your mana pool.
Put Arid Seafloor on top of your library: Add to your mana pool.
, : Add one mana of any color to your mana pool.
: Add 
or 
to your mana pool.
to your mana pool. , : Add one mana of any color to your mana pool.
