(Growth Stronghold isn't a spell.)
When Growth Stronghold enters the battlefield, sacrifice it unless you pay .
, : Look at target player's hand.
: Add to your mana pool. If you played a land this turn, Add to your mana pool instead.
.
, 
: Look at target player's hand.: Add to your mana pool. If you played a land this turn, Add 
to your mana pool instead.
