"Bribe the Guards" isn't an official Magic: The Gathering keyword or ability—it doesn't exist in the comprehensive rules or on any printed card. You may be thinking of a flavor-based mechanic from a casual variant, a custom card, or confusing it with something like "Council's dilemma," "voting," or "monarchy" mechanics that involve interacting with other players.
If it's a homebrew or custom card you've encountered, its function depends entirely on that card's specific text—so read it carefully and clarify the timing, who chooses, and what resource is "paid." In sanctioned Commander, no such ability applies.
If you can share the exact card name or its rules text, I can explain how it works, the common misplays around it, and when it matters in multiplayer Commander games.