Konela, Goddess of Death

Indestructible, Deathtouch
Konela, Goddess of Death can't attack or block unless you have at least 5 creatures in your graveyard
If Konela, Goddess of Death would become block by a non-black creature, she gains double strike until end of attack step
As long as Konela, Goddess of Death is on the battlefield, you have hexproof
All creatures you control gain First Strike