Whenever Hollow Vents becomes tapped, it deals 1 damage to you.
: Add or to your mana pool.
Put Hollow Vents on top of your library: Add to your mana pool.
, , Sacrifice Hollow Vents: Target player draws two cards, then discards two cards.
: Add 
or 
to your mana pool.
to your mana pool. , , Sacrifice Hollow Vents: Target player draws two cards, then discards two cards.
