Skeleton

• Horn of WinterLevel 1
• LeapLevel 1
• Raise SkulkerLevel 1
• Rune StrikeLevel 1
• Shambling RushLevel 1
• Sludge BelcherLevel 1
• Dark CommandLevel 9
• Ancient PowerLevel 10
• AsphyxiateLevel 10
• Blood FeastLevel 10
• Bloodied BladeLevel 10
• Boiling PointLevel 10
• BonegrinderLevel 10
• BrittleLevel 10
• CoagulopathyLevel 10
• ConsumptionLevel 10
• Cryogenic ChamberLevel 10
• Dance of MidnightLevel 10
• Dancing Rune WeaponLevel 10
• Death StrikeLevel 10
• Enduring StrengthLevel 10
• EnfeebleLevel 10
• Festering ScytheLevel 10
• Festering StrikeLevel 10
• Frigid ExecutionerLevel 10
• FrostreaperLevel 10
• Ghoulish FrenzyLevel 10
• Grave MasteryLevel 10
• Heart StrikeLevel 10
• HemostasisLevel 10
• Ice PrisonLevel 10
• Icebound FortitudeLevel 10
• Icy OnslaughtLevel 10
• Insidious ChillLevel 10
• Killing StreakLevel 10
• MarrowrendLevel 10
• Necromancer's CunningLevel 10
• ObliterateLevel 10
• ObliterationLevel 10
• Perseverance of the Ebon BladeLevel 10

And 39 more.

The free addon pack puts it on your bars, or see the whole Death Knight spell list.