Moonring Tubes enters the battlefield tapped.
: Add to your mana pool. If you played a land this turn, Add to your mana pool instead.
, , Sacrifice Moonring Tubes: Target player draws two cards, then discards two cards.
: Add 
to your mana pool. If you played a land this turn, Add 
to your mana pool instead., , Sacrifice Moonring Tubes: Target player draws two cards, then discards two cards.
