Plague Priest

Edict Master —While this creature is on the battlefield, you have a sorcery called Decree Edict constantly in your command zone—use it to show you the Plague Priest Edicts to select one. Some edicts have buffs based on how much it is being decreed. Rot (when this does damage, it applies a decay counter—get Decayed after you reach 3 decay counters), Plague-Addled (=colorless mana must be paid by sacrificing a land or paying 3 life)
{c}{b}{t} Warpstone Imbuement: All Plague Monks gai