Kes, Embraced by Darkness

+1: Target opponent may discard a card. If they don't, put a -1/-1 counter on target creature they control.
-2: Create a 2/2 black Zombie creature token for every two creatures with a -1/-1 counter on them rounded down.
-8: You get an emblem with "All lands become swamps, and creatures you control have swampwalk."