Bog-Veil Predation

At the beginning of each combat, if you control
no Serpents, create a 3/4 black Serpent creature
token with menace.
Whenever an opponent attacks you, that player
sacrifices an attacking creature for each Serpent
you control.
"Quell that light there, stranger. Unless you want your
path through the bog to be down a serpent's gullet."
—Mulligan, bayou guide