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