Relentless Pursuit

For each creature that blocked this turn, create a 2/2 Black Zombie Knight creature token with First Strike. If you control at least six Swamps, double the number of tokens created in this way.
Take an extra turn after this one unless each player sacrifices all creatures they control that blocked this turn. If they do, creature tokens created by Relentless Pursuit gain Defender.
When the Hand of Death rides to war, all foes fall.