Color Identity: W, U, B

Prerequisites

  1.  
    Merieke Ri Berit
    Merieke Ri Berit     and
    Intruder Alarm
    Intruder Alarm     on the battlefield.
  2. Merieke Ri Berit
    Merieke Ri Berit     does not have summoning sickness.

Steps

  1. Tap
    Merieke Ri Berit
    Merieke Ri Berit     to gain control of target creature.
  2. Have a creature enter the battlefield.
  3. Merieke Ri Berit
    Merieke Ri Berit     untaps, repeat loop.

Results

  1. Destroy any creature whenever a creature enters the battlefield.

Metadata

  1. In 334 decks according to EDHREC.
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