the front side of Yenna, Redtooth Regent
the back of a classic MtG card
the front side of Instill Energy
the back of a classic MtG card
the front side of Phantatog
the back of a classic MtG card

Color Identity: G, W, U

Initial Card State

  1.  All permanents on the battlefield.

Notable Prerequisites

  1. You control a creature that can tap to produce at least ({2} magic symbol)  .
  2. Yenna does not have summoning sickness.

Steps

  1. Activate the mana-producing creature by tapping it, adding at least ({2} magic symbol)  .
  2. Activate Yenna by paying ({2} magic symbol)   and tapping it, creating a token copy of Instill Energy attached to the mana-producing creature, then untapping Yenna and causing you to scry 2.
  3. Activate the Instill Energy token by paying ({0} magic symbol)  , untapping the mana-producing creature.
  4. Activate Phantatog's first ability by sacrificing the Instill Energy token, causing Phantatog to get +1/+1 until end of turn.
  5. Repeat.

Results

  1. Infinitely large Phantatog until end of turn.
  2. Infinite scry 2.

Metadata

  1. In 7 decks according to EDHREC.
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