Color Identity: G, W, U

Initial Card State

  1.  Urban Retreat in hand.
  2.  All other permanents on the battlefield.

Steps

  1. Activate Scorched Ruins by tapping it, adding ({C} magic symbol)  ({C} magic symbol)  ({C} magic symbol)  ({C} magic symbol)  .
  2. Activate Urban Retreat by paying ({2} magic symbol)   and returning a tapped creature you control from the battlefield to its owner's hand, putting Urban Retreat from your hand onto the battlefield.
  3. When Urban Retreat enters, Springheart Nantuko triggers. Choose not to pay and create a 1/1 Insect creature token.
  4. Activate the card with crew, station and/or saddle by tapping the Insect.
  5. Activate Oboro Breezecaller by paying ({2} magic symbol)   and returning Urban Retreat from the battlefield to your hand, untapping Scorched Ruins.
  6. Repeat.

Results

  1. Infinite ETB.
  2. Infinite LTB.
  3. Infinite colorless mana.
  4. Infinite landfall triggers.
  5. Infinite mana lands you control can produce.
  6. Infinite tapped creature tokens.
  7. Infinite untap of lands you control.
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