(: Add or to your mana pool.)
At the beginning of your end step, if you didn't cast any spells this turn, Fetid Vents deals 1 damage to you.
, , Sacrifice Fetid Vents: Put a -1/-1 counter on target creature.
, : Scry 2.
: Add 
or 
to your mana pool.), , Sacrifice Fetid Vents: Put a -1/-1 counter on target creature.
, : Scry 2.
