What it does
"Reverberating Summons" isn't an actual Magic: The Gathering keyword or ability—it doesn't exist in any official rules, card text, or set. I can't explain its function because there's nothing to describe, and inventing rules for it would only mislead you at the table.
If you encountered this term, it may be a homebrew/custom card, a misremembered name, or confusion with a real mechanic. Some possibilities you might mean: Echo (pay a cost the turn after a creature enters or sacrifice it), Encore (exile and pay to make token copies that attack), Cascade, or convoke/conspire effects involving summoning multiple creatures.
Tell me the exact card name or where you saw "Reverberating Summons," and I'll identify the real ability and explain how it actually works in Commander.
Iconic cards with Reverberating Summons
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