Color Identity: W, U, B

Prerequisites

  1.  All permanents on the battlefield.

Steps

  1. Whenever a creature enters the battlefield,
    Lethal Vapors
    Lethal Vapors     triggers, destroying that creature.
  2. Because
    Stony Silence
    Stony Silence     prevents
    Lethal Vapors
    Lethal Vapors    's activated ability from being activated, it cannot be destroyed due to its ability.

Results

  1. Destroy all creatures that enter the battlefield.

Metadata

  1. In 1 deck according to EDHREC.
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