(Thicket Slagheap isn't a spell.)
Thicket Slagheap enters the battlefield tapped.
Sacrifice a land: You gain 1 life.
: Add or to your mana pool.
: Add to your mana pool. Put Thicket Slagheap on top of your library.
: Add 
or 
to your mana pool.: Add 
to your mana pool. Put Thicket Slagheap on top of your library.
