What it does
"Genestealer's Kiss" isn't a standard Magic keyword or ability—it doesn't correspond to any printed mechanic in the game. You may be thinking of a specific card name, flavor text, or a term from the Warhammer 40,000 universe (Genestealers are a Tyranid creature type that featured in the Warhammer 40,000 Commander decks released as part of Universes Beyond).
If you encountered this on a card, it's likely a card's name rather than a keyword ability, and the actual rules text would be printed separately in the text box. Magic's mechanics are governed by the words in the ability lines, not the evocative title.
If you can share the full card or the exact ability text you're seeing, I can break down precisely what it does, the rules nuances, and how it plays in Commander.
Iconic cards with Genestealer's Kiss
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