Somehow, I have the mighty suspicion that this card was originally produced for RNA (as this would have worked much better than the shade)... but that may just be my tinfoil hat talking.
There are 16 mono black creatures with haste
Gurmag Swiftwing
Manor Skeleton
Frogtosser Banneret
Nether Traitor
Nether Shadow
Yahenni, Undying Partisan
Deepcavern Imp
Duskmantle Prowler
Blackcleave Goblin
Ichorid
Crazed Skirge
Ashen Ghoul
Crypt Rippet
Mirri the Cursed
Akuta, Born of Ash
Spirit of the Night
Appropriately costed - check
Impacts the board immediately - check
Great art - check
Should impact limited and constructed - check
Gurmag Swiftwing
Manor Skeleton
Frogtosser Banneret
Nether Traitor
Nether Shadow
Yahenni, Undying Partisan
Deepcavern Imp
Duskmantle Prowler
Blackcleave Goblin
Ichorid
Crazed Skirge
Ashen Ghoul
Crypt Rippet
Mirri the Cursed
Akuta, Born of Ash
Spirit of the Night