Color Identity: U, B, R

Prerequisites

  1.  All permanents on the battlefield.
  2. ({2} magic symbol)  ({B} magic symbol)   available.

Steps

  1. Activate
    Altar of Dementia
    Altar of Dementia
    by sacrificing
    Witch Engine
    Witch Engine
    , causing target player to mill cards equal to
    Witch Engine
    Witch Engine
    's power.
  2. Activate
    Witch Engine
    Witch Engine
    's unearth ability by paying ({2} magic symbol)  ({B} magic symbol)  , returning it from your graveyard to the battlefield, giving it haste and exiling it at end of turn or when it leaves the battlefield.
  3. Activate
    Witch Engine
    Witch Engine
    by tapping it.
  4. Holding priority, activate
    Altar of Dementia
    Altar of Dementia
    by sacrificing
    Witch Engine
    Witch Engine
    .
  5. Both
    Witch Engine
    Witch Engine
    's undying ability and
    Void Maw
    Void Maw
    attempt to exile
    Witch Engine
    Witch Engine
    when it would be put into your graveyard.
  6. Choose to apply the
    Void Maw
    Void Maw
    replacement effect, exiling
    Witch Engine
    Witch Engine
    .
  7. Resolve the
    Witch Engine
    Witch Engine
    ability from step 3, adding ({B} magic symbol)  ({B} magic symbol)  ({B} magic symbol)  ({B} magic symbol)  .
  8. Resolve the
    Altar of Dementia
    Altar of Dementia
    ability, causing target player to mill cards equal to
    Witch Engine
    Witch Engine
    's power.
  9. Activate
    Void Maw
    Void Maw
    by putting
    Witch Engine
    Witch Engine
    from exile into your graveyard, giving
    Void Maw
    Void Maw
    +2/+2 until end of turn.
  10. Repeat from step 2.

Results

  1. Infinite black mana.
  2. Infinite ETB.
  3. Infinite LTB.
  4. Infinitely large
    Void Maw
    Void Maw
    until end of turn.
  5. Infinite mill.
  6. Infinite sacrifice triggers.
  7. Infinite self-mill.

Metadata

  1. In 3 decks according to EDHREC.
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