Shriek for Devotion

Choose two permanents you control and three permanents that one opponent controls and
separate them into two piles. That player chooses
one pile. Each permanent in the chosen pile is sacrificed by it's controller.
Flashback {3}{b}{b}{b}
Whether man or beast, its own follower or unfortunate passerby, the Maw of the Wailing Marsh demands a
feast all the same.