Glacial Cavern enters the battlefield tapped unless you pay .
, Pay 1 life: Add or to your mana pool.
, , Sacrifice Glacial Cavern: Draw a card.
, , Sacrifice Glacial Cavern: Target player draws two cards, then discards two cards.
.
, Pay 1 life: Add 
or 
to your mana pool., , Sacrifice Glacial Cavern: Draw a card., , Sacrifice Glacial Cavern: Target player draws two cards, then discards two cards.
