Fetid Pools enters the battlefield tapped unless you pay .
: Add or to your mana pool.
Put Fetid Pools on top of your library: Add to your mana pool.
, , Sacrifice Fetid Pools: Target creature gets -2/-2 until end of turn.
.
: Add 
or 
to your mana pool.
to your mana pool. , , Sacrifice Fetid Pools: Target creature gets -2/-2 until end of turn.
