When Moonring Underground enters the battlefield, sacrifice it unless you pay 3 life.
, : Add to your mana pool.
: Moonring Underground becomes a 2/2 blue Wizard creature until end of turn. It's still a land.
, 
: Add 
to your mana pool., : Add to your mana pool.
: Moonring Underground becomes a 2/2 blue Wizard creature until end of turn. It's still a land.
