How can you create a combo with Horobi, Death's Wail, Shadow Alley Denizen, Ogre Slumlord?
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[START OF COMBO]This combo can be formed with Horobi, Death's Wail, Shadow Alley Denizen, Ogre Slumlord

Color identity: B
Mana cost: 
Steps:
  1. Put a black creature onto the battlefield under your control.
  2. Shadow Alley Denizen triggers, targeting any nontoken creature an opponent controls.
  3. Horobi triggers, destroying the targeted creature.
  4. When the creature dies, Ogre Slumlord triggers, creating a 1/1 Rat creature token.
  5. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Destroy any number of nontoken creatures whenever a black creature enters the battlefield under your control
  - Destroy any number of nontoken creatures whenever a creature dies[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - You have a way to put a black creature onto the battlefield under your control.
[END OF COMBO PREREQUISITES]
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