(Copperline Graveyard isn't a spell.)
Copperline Graveyard enters the battlefield tapped unless you pay 1 life.
, : Tap target artifact with converted mana cost X or less.
, : Add to your mana pool.
, 
: Tap target artifact with converted mana cost X or less.
, : Add 
to your mana pool., : Add to your mana pool.
