the front side of The Thirteenth Doctor
the back of a classic MtG card
the front side of Gogo, Master of Mimicry
the back of a classic MtG card

Color Identity: G, U

Initial Card State

  1.  The Thirteenth Doctor and Gogo on the battlefield (Gogo without summoning sickness).

Notable Prerequisites

  1. Creatures you control that have counters on them can tap to produce at least ({2} magic symbol)  .
  2. Gogo has a counter on it.

Steps

  1. At the beginning of your end step, The Thirteenth Doctor triggers.
  2. Holding priority, activate any number of creatures you control that have counters on them by tapping them, adding at least ({2} magic symbol)  .
  3. Activate Gogo by paying ({2} magic symbol)   and tapping it, copying The Thirteenth Doctor's trigger.
  4. Resolve the copy of The Thirteenth Doctor's trigger, untapping all creatures you control that have a counter on them.
  5. Repeat from step 2.

Results

  1. Infinite mana creatures you control with counters on them can produce.
  2. Infinite untap of creatures you control with counters on them.

Metadata

  1. In 201 decks according to EDHREC.
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