the front side of Hidetsugu, Devouring Chaos
the back of a classic MtG card
the front side of Intruder Alarm
the back of a classic MtG card
the front side of Mortuary
the back of a classic MtG card
the front side of Stonecoil Serpent
the back of a classic MtG card

Color Identity: U, B, R

Initial Card State

  1.  Stonecoil Serpent in hand.
  2.  All other permanents on the battlefield.

Notable Prerequisites

  1. Hidetsugu does not have summoning sickness.
  2. Creatures you control can tap to produce at least ({3} magic symbol)  ({R} magic symbol)  .

Steps

  1. Activate all mana-producing creatures you control by tapping them, adding at least ({3} magic symbol)  ({R} magic symbol)  .
  2. Cast Stonecoil Serpent by paying ({0} magic symbol)  .
  3. Stonecoil Serpent enters the battlefield and dies as a state-based action due to having zero toughness.
  4. Intruder Alarm and Mortuary trigger.
  5. Resolve the Intruder Alarm trigger, untapping all creatures.
  6. Resolve the Mortuary trigger, putting Stonecoil Serpent on top of your library from your graveyard.
  7. Activate Hidetsugu's second ability by paying ({2} magic symbol)  ({R} magic symbol)   and tapping it, exiling Stonecoil Serpent from the top of your library and allowing you cast it this turn.
  8. Repeat.

Results

  1. Infinite +1/+1 counters on Stonecoil Serpent.
  2. Infinite death triggers.
  3. Infinite ETB.
  4. Infinite LTB.
  5. Infinite mana creatures you control can produce.
  6. Infinite storm count.
  7. Infinite untap of all creatures.

Metadata

  1. In 0 decks according to EDHREC.
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