Ambitious Dragonborn without a -1/-1 counter on it).
Notable Prerequisites
You control a creature with power X or greater, or you have a creature card in your graveyard with power X or greater.
Steps
Activate
Grimgrin by sacrificing
Ambitious Dragonborn.
When
Ambitious Dragonborn dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to its replacement effect.
Resolve the
Grimgrin ability.
Repeat.
Results
Infinite +1/+1 counters on a creature.
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.