Haunted Bayou

({t}: Add {b} or {g}.)
As Haunted Bayou enters the battlefield, you
may tap an untapped black or green nontoken permanent you control. If you don't, Haunted
Bayou enters the battlefield tapped.
Its vines strangle the careless and its muck consumes
the foolhardy. If the horrors of the night don't get to
them first.