When Forest Slagheap enters the battlefield, sacrifice it unless you pay 1 life.
: Add or to your mana pool.
: Add to your mana pool. Put Forest Slagheap on top of your library.
Sacrifice an artifact: You gain 2 life.
: Add 
or 
to your mana pool.: Add 
to your mana pool. Put Forest Slagheap on top of your library.
