(Overgrown Springs isn't a spell.)
When Overgrown Springs enters the battlefield, return a land you control to its owner's hand.
, : Scry 2.
: Add or to your mana pool.
Sacrifice Overgrown Springs: Add or to your mana pool.
, 
: Scry 2.: Add 
or 
to your mana pool. or to your mana pool.
