Massacre Pact

Destroy all creatures you don't control. You get
an emblem with "You can't gain life. At the beginning of your upkeep, you lose X life, where
X is the amount of life you have less than your starting life total." Then, you lose 5 life.
"A beautiful loss is still a loss, and an ugly win is still
a win."
-Toshinobu Matsumiya