Grim Poppet 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
Krark-Clan Grunt ability.
Repeat.
Notes
You can remove the additional -1/-1 counters from
Grim Poppet and put them on other creatures as desired.
Results
Infinite creature LTB.
Infinite creature ETB.
Infinite creature sacrifice triggers.
Infinite death triggers.
Infinite -1/-1 counters.
Infinitely powerful creature until end of turn.
Metadata
Bracket tag
ExhibitionBracket 1+
For any deck
1
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3
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5
1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.