"Dynastic Command Node" isn't an actual Magic: The Gathering keyword or ability—it doesn't exist in the official rules or on any printed card. It sounds like it could be a flavorful made-up term, possibly confusing real mechanics like "command" abilities, the Command Zone, or set-specific keywords.
If you're thinking of something real, you might mean the Command Zone (where your commander, emblems, and certain effects live), or keywords like Myriad, Convoke, or Dethrone that show up in Commander-flavored sets. There's also Lieutenant and Join Forces from Commander products.
If you saw this on a card or in a custom/homebrew set, double-check the exact wording—it may be a fan-made or unofficial card. Share the actual card text and I'll happily break down what it really does and how it plays in EDH.