(Lava Crypt isn't a spell.)
Lava Crypt enters the battlefield tapped unless you sacrifice a creature.
, : 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.
