How can you create a combo with Lethal Vapors, Pithing Needle?
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[START OF COMBO]This combo can be formed with Lethal Vapors, Pithing Needle

Color identity: B
Mana cost: 
Steps:
  1. Whenever a creature enters the battlefield, Lethal Vapors triggers, destroying that creature.
  2. Because Pithing Needle prevents Lethal Vapors's activated ability from being activated, it cannot be destroyed due to its ability.[END OF COMBO STEPS]

Result:
  - Destroy all creatures that enter the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - "Lethal Vapors" chosen with Pithing Needle.
[END OF COMBO PREREQUISITES]
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