Bloodied Ghost dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it. When it enters,
Bloodied Ghost will put a -1/-1 counter on itself, removing the +1/+1 counter.
Resolve the
Spawning Pit ability.
Repeat.
Activate
Spawning Pit by sacrificing
Bloodied Ghost.
When
Bloodied Ghost dies, its undying ability triggers, returning it from your graveyard to the battlefield without a +1/+1 counter on it due to its replacement effect.
Resolve the
Spawning Pit ability.
Repeat.
Results
Infinite charge counters on a permanent.
Infinite creature ETB.
Infinite creature LTB.
Infinite creature sacrifice triggers.
Infinite death triggers.
Metadata
Bracket tag
ExhibitionBracket 1+
For any deck
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1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.