Curse of Enfeeblement - Either destroy enemy weapon, or reduce the damage of the weapon.
Healthstone - Equip like a weapon, but allow it to heal the hero when activated.
Fear - same as Sap.
Seed of Corruption - spell that grants a minion deathrattle: 2 damage to all minions.
Soulshatter - grant minion taunt or secret: opponent targets a 0/4 version of the warlock.