Keth'ek, Lord of Plagues

+2: Up to three target creatures get -2/-1
-2: Create an emblem that states "Any creatures you control that get -X/-X get +X/+X instead.
-6: Destroy all creatures with any -X/-X counters and replace them with 1/1 Plague Beetles that deal 1 damage to their owner on their upkeep.