Malignant Mist

Commander creatures you own named Abaddon, Lord of Avernus have “Whenever this creature deals combat damage to a player, that player gets a curse counter. Whenever a creature you control deals combat damage to a player, it deals that much damage plus X, where X is the number of curse counters that player has.” (You can choose this Facet as a second commander only if Abaddon, Lord of Avernus is your commander.){/fontsize12}