(Havenwood Furnace isn't a spell.)
Havenwood Furnace enters the battlefield tapped 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.
