Mystic Underground enters the battlefield tapped unless you pay .
: Add to your mana pool. Return Mystic Underground to its owner's hand.
: Mystic Underground becomes a 2/1 blue and black Crab creature until end of turn. It's still a land.
.
: Add 
to your mana pool. Return Mystic Underground to its owner's hand.: Mystic Underground becomes a 2/1 blue and black Crab creature until end of turn. It's still a land.
