What it does
Brood Telepathy isn't a standard Magic keyword—it doesn't appear in the comprehensive rules or on any official card. You may be thinking of a custom, fan-made, or homebrew ability, or possibly confusing it with a real mechanic.
If you encountered "Brood Telepathy" on a card, double-check the exact wording, as the rules text itself defines what it does. It's possible it's flavor text being mistaken for an ability, a card from an unofficial set, or a misremembered name. Real "Brood" cards (like Brood Birthing or Brood Sliver) reference Eldrazi Spawn/Scion tokens or Sliver tribal synergies, while telepathy-style effects usually involve revealing or looking at hidden information.
If you can share the full card text or where you saw it, I can explain how it actually functions and how it'd matter in Commander.
Iconic cards with Brood Telepathy
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