When Fetid Vents enters the battlefield, return a land you control to its owner's hand.
: Add or to your mana pool.
Sacrifice Fetid Vents: Add or to your mana pool.
Cycling (, Discard this card: Draw a card.)
: Add 
or 
to your mana pool. or to your mana pool.
(, Discard this card: Draw a card.)
