Top 5 mono black life drain spells

[Noblellama]

Throwing together a mono black life drain and looking for some input.

What would you guys consider your top 5 life drain spells and why?

[Gorzo]

{Exsanguinate} and {Debt to the Deathless} if multiplayer, for obvious reasons.

{Corrupt} and {Tendrils of Corruption} are both pretty powerful.  {Death Grasp} is great if you have white in there.

[Pirate John]

Depending on your creature size... {Esscence Harvest} can just wreck for a 3-drop

EDIT: accidentally called it a 4-drop

[Spikepit]

 {Consume Spirit} and {Drain Life} are good 1v1 leech spells.

[Anoobass]

 {Gray Merchant of Asphodel} amazing in devo deck.

[Steerpike]

 {Exquisite Blood}!