the front side of Prowling Geistcatcher
the back of a classic MtG card
the front side of Kiki-Jiki, Mirror Breaker
the back of a classic MtG card
the front side of Altar of Dementia
the back of a classic MtG card

Color Identity: B, R

Initial Card State

  1.  All permanents on the battlefield.

Steps

  1. Activate Kiki-Jiki by tapping it, creating a token copy of Prowling Geistcatcher with haste.
  2. Activate Altar of Dementia by sacrificing Kiki-Jiki.
  3. When Kiki-Jiki dies, the nontoken and token Prowling Geistcatcher's first abilities trigger.
  4. Resolve the token Prowling Geistcatcher's trigger, exiling Kiki-Jiki from your graveyard.
  5. Resolve the nontoken Prowling Geistcatcher's trigger, doing nothing.
  6. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Kiki-Jiki's power.
  7. Activate Altar of Dementia by sacrificing the Prowling Geistcatcher token.
  8. When the token Prowling Geistcatcher dies, its second ability and the nontoken Prowling Geistcatcher's first ability triggers.
  9. Resolve the nontoken Prowling Geistcatcher trigger, putting a +1/+1 counter on it.
  10. Resolve the token Prowling Geistcatcher trigger, returning Kiki-Jiki from exile to the battlefield.
  11. Resolve the Altar of Dementia ability, causing target player to mill cards equal to the token Prowling Geistcatcher's power.
  12. Repeat.

Results

  1. Infinite +1/+1 counters on Prowling Geistcatcher.
  2. Infinite death triggers.
  3. Infinite ETB.
  4. Infinite LTB.
  5. Infinite mill.
  6. Infinite sacrifice triggers.
  7. Infinite self-mill.

Metadata

  1. In 48 decks according to EDHREC.
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