(Elven Hollow isn't a spell.)
Elven Hollow enters the battlefield tapped.
Discard two cards: Put a 2/2 black Zombie creature token onto the battlefield.
: Add to your mana pool. If you played a land this turn, Add to your mana pool instead.
: Add 
to your mana pool. If you played a land this turn, Add 
to your mana pool instead.
