the front side of Tainted Observer
the back of a classic MtG card
the front side of Ashnod's Altar
the back of a classic MtG card
the front side of Scurry Oak
the back of a classic MtG card

Color Identity: G, U

Initial Card State

  1.  All permanents on the battlefield.

Notable Prerequisites

  1. You have a way to cause a creature to enter the battlefield under your control.
  2. Scurry Oak has at least one +1/+1 counter on it.

Steps

  1. Cause a creature to enter the battlefield under your control.
  2. When the creature enters the battlefield, Tainted Observer triggers.
  3. Holding priority, activate Ashnod's Altar by sacrificing the creature, adding ({C} magic symbol)  ({C} magic symbol)  .
  4. Resolve the Tainted Observer trigger, causing you to pay ({2} magic symbol)   to put a +1/+1 counter on Scurry Oak.
  5. Scurry Oak triggers, creating a 1/1 Squirrel creature token.
  6. Repeat from step 2.

Results

  1. Infinite +1/+1 counters on Scurry Oak.
  2. Infinite death triggers.
  3. Infinite ETB.
  4. Infinite LTB.
  5. Infinite proliferate.
  6. Infinite sacrifice triggers.

Metadata

  1. In 31 decks according to EDHREC.
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