The Lunacy deck can be turned into to get the Darkmoon Card: Madness. The card gives 51 stamina and has an equip that whenever you land a killing blow on a target, you get a class-specific buff. The buffs are:
Delusional: +70 attack power (Rogue, Hunter, Paladin, Warrior, Druid) Dimentia: "Down the rabbit hole..." Every 5 seconds either gives you +5% or -5% damage/healing. (Druid, Shaman, Priest, Warlock, Mage, Paladin) Kleptomania: +35 agility (Warrior, Rogue, Paladin, Hunter, Druid) Manic: +35 haste (spell, melee and ranged) (All classes) Martyr Complex: +35 stamina (All classes) Meglomania: +41 damage/healing (Druid, Shaman, Priest, Warlock, Mage, Paladin) Narcissism: +35 intellect (Druid, Shaman, Priest, Warlock, Mage, Paladin, Hunter) Paranoia: +35 spell/melee/ranged crit strike rating (All classes) Sociopath: +35 strength (Paladin, Rogue, Druid, Warrior)
Each of the buffs lasts for 30 seconds.