Color Identity: B, G

Prerequisites

  1.  
    Grist, the Hunger Tide
    Grist
    in exile (
    Grist, the Hunger Tide
    Grist
    exiled by
    Agatha's Soul Cauldron
    Agatha's Soul Cauldron
    ).
  2.  
    Agatha's Soul Cauldron
    Agatha's Soul Cauldron
    and
    Metallic Mimic
    Metallic Mimic
    on the battlefield.
  3. Metallic Mimic
    Metallic Mimic
    has at least one +1/+1 counter on it.
  4. "Insect" chosen with
    Metallic Mimic
    Metallic Mimic
    .

Steps

  1. Activate
    Metallic Mimic
    Metallic Mimic
    using
    Grist, the Hunger Tide
    Grist
    's first loyalty ability by putting a loyalty counter on it, causing you to create a 1/1 Insect creature token and mill a card, and then put a loyalty counter on
    Metallic Mimic
    Metallic Mimic
    and repeat the process if the card was an Insect.
  2. The Insect enters the battlefield with a +1/+1 counter on it due to
    Metallic Mimic
    Metallic Mimic
    , causing it to have
    Grist, the Hunger Tide
    Grist
    's abilities.
  3. Repeat from step 1 using the Insect token instead.

Results

  1. Infinite creature tokens.
  2. Infinite ETB.
  3. Infinite self-mill.

Metadata

  1. In 186 decks according to EDHREC.
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