Copperline Key enters the battlefield tapped.
: Add or to your mana pool.
: Add to your mana pool. Put Copperline Key on top of your library.
: Return Copperline Key to its owner's hand.
: Add 
or 
to your mana pool.: Add 
to your mana pool. Put Copperline Key on top of your library.: Return Copperline Key to its owner's hand.
