(Tranquil Slagheap isn't a spell.)
Tranquil Slagheap enters the battlefield tapped unless you pay .
Sacrifice a land: You gain 1 life.
: Add to your mana pool. If you played a land this turn, Add to your mana pool instead.
.
: Add to your mana pool. If you played a land this turn, Add 
to your mana pool instead.
