Color Identity: U

Prerequisites

  1.  All permanents on the battlefield.
  2. Pemmin's Aura
    Pemmin's Aura     attached to
    Steel Overseer
    Steel Overseer    .
  3. Steel Overseer
    Steel Overseer     does not have summoning sickness.

Steps

  1. Activate
    Steel Overseer
    Steel Overseer     by tapping it, putting a +1/+1 counter on each artifact creature you control.
  2. Activate
    Crystalline Crawler
    Crystalline Crawler    's first ability by removing a +1/+1 counter from it, adding ({U} magic symbol)  .
  3. Activate
    Pemmin's Aura
    Pemmin's Aura    's first ability by paying ({U} magic symbol)  , untapping
    Steel Overseer
    Steel Overseer    .
  4. Repeat.

Results

  1. Infinite +1/+1 counters on all artifact creatures you control except
    Crystalline Crawler
    Crystalline Crawler    .

Metadata

  1. In 10 decks according to EDHREC.
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