Bristly Bill by paying ({3} magic symbol) ({G} magic symbol) ({G} magic symbol) , doubling the number of +1/+1 counters on each creature you control.
Activate
Crystalline Crawler's first ability five times by removing five +1/+1 counters from it, adding ({3} magic symbol) ({G} magic symbol) ({G} magic symbol) .
Repeat.
If
Crystalline Crawler has six or more +1/+1 counters on it to start the combo, this combo results in infinite colored mana.
Results
Infinite +1/+1 counters on certain creatures.
Infinite colored mana.
Metadata
Bracket tag
SpicyBracket 3-4+
Probably 3 or 4, but hard to classify
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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.