What it does
"Daemon Sword" isn't a standard Magic keyword or ability—it's not part of the comprehensive rules, and there's no official card or mechanic by that name in MTG. You may be thinking of one of the "Sword of X and Y" equipment cycle (like Sword of Fire and Ice), or possibly confusing it with a card from another game entirely.
If you encountered "Daemon Sword" on a card, double-check the exact name and oracle text via Gatherer or Scryfall, since proxies, custom cards, and non-Magic games sometimes borrow MTG-style framing. The real equipment swords in Commander matter a ton: they grant protection from two colors (dodging removal and enabling unblockable hits) plus powerful triggered abilities on combat damage.
Tell me the precise card name or text, and I'll give you an accurate breakdown of how it works and when it matters.
