Blighted Arrow

• Blood ShieldLevel 1
• Recently Used Death StrikeLevel 1
• Death's AdvanceLevel 9
• LichborneLevel 9
• Anti-Magic ZoneLevel 10
• Army of the DeadLevel 10
• AssimilationLevel 10
• BlightfallLevel 10
• Blood BoilLevel 10
• Blood BondLevel 10
• Blood DrawLevel 10
• Blood MistLevel 10
• Bloody ReflectionLevel 10
• Clawing ShadowsLevel 10
• Coil of DevastationLevel 10
• Commander of the DeadLevel 10
• Control UndeadLevel 10
• Corpse ExploderLevel 10
• Dark TransformationLevel 10
• Death GateLevel 10
• Death PactLevel 10
• Gorefiend's GraspLevel 10
• Grip of the DeadLevel 10
• HeartbreakerLevel 10
• Infected ClawsLevel 10
• Leeching StrikeLevel 10
• LifebloodLevel 10
• Lord of the DeadLevel 10
• OssuaryLevel 10
• OutbreakLevel 10
• PutrefyLevel 10
• Rapid DecompositionLevel 10
• ReapingLevel 10
• Relish in BloodLevel 10
• Sanguinary BurstLevel 10
• Scourge StrikeLevel 10
• Summon GargoyleLevel 10
• Unholy DevotionLevel 10
• VoraciousLevel 10
• Lesser Anti-Magic ShellLevel 14

And 30 more.

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