Assuming we aren’t talking about things that are currently baseline…
DK:
Breath of Syndragosa
Abomination Limb
Gorefiends Grasp (for DPS DKs)
Chill Streak (take it off the PvP talents and rework it - my thoughts here: Feedback on Frost DK - Community / WoW Community Council - World of Warcraft Forums (blizzard.com))
Blood/Frost/Unholy Presence
Cold Heart