What it does
"Unrivaled Lethality" isn't an official Magic: The Gathering keyword or ability—it doesn't appear in the comprehensive rules or on any printed card. It sounds like it could be flavor text, a custom/homebrew mechanic, or a made-up term, so there's no standardized rules text to explain.
If you encountered this on a card, double-check the exact wording and set—it may be a misremembering of real keywords like Deathtouch (any damage dealt destroys the creature) or Double Strike. If it's a custom card from a homebrew set or a casual playgroup, you'll need to ask whoever created it for the intended rules, since unofficial mechanics aren't governed by official Magic rulings.
For Commander specifically, stick to officially recognized keywords to avoid disputes—rules clarity matters a lot in multiplayer games where table consensus governs unusual interactions.
Iconic cards with Unrivaled Lethality
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