(Treetop Sandstone isn't a spell.)
When Treetop Sandstone enters the battlefield, sacrifice it unless you pay 2 life.
, : Scry 2.
: Add to your mana pool. Return Treetop Sandstone to its owner's hand.
, 
: Scry 2.: Add 
to your mana pool. Return Treetop Sandstone to its owner's hand.
