Open any deck on Moxfield and this adds a panel below the decklist showing the combos your list already contains and, more usefully, the combos you're one or two cards short of finishing. Combos are grouped by how close they are:

In your deck every piece is already in the 99 or the command zone.
One or two cards away the combos worth a slot, in your colors.
Yours with a different commander the pieces are there, the command zone isn't.
Needs a different commander for when you're weighing a swap.

Each combo shows what it produces, the mana and prerequisites, and a strip of its pieces: solid for cards you own, dashed and marked with a + for the ones you'd be adding. Italic pieces are Spellbook templates "any creature with flying" rather than a specific card. The "Missing at most" control is the one to reach for. Set it to 1 and the panel becomes a shopping list: every combo a single card would complete. Filter by card or effect name to check a specific line, or switch to Everything to browse. Combos that would break your deck's color identity are left out, since they aren't choices you can actually make. A few things worth knowing

Works on public decks. Private and unpublished decks aren't readable, and the panel will say so.
Results are cached for six hours. Hit Refresh in the panel header after editing a deck.
Moxfield rate-limits automated traffic. Refresh too often and you'll get turned away for a minute.
Deck contents are sent to Commander Spellbook to look up combos. Nothing else leaves your browser, and there's no tracking of any kind.

Credit All combo data comes from <a href="https://commanderspellbook.com">Commander Spellbook</a>, a community-run, open source project. This extension just brings their results to the deck page please support them. Not affiliated with or endorsed by Moxfield or Commander Spellbook. If you have any feedback, bugs, or feature requests, please send them to info.manaburn@gmail.com Combo Finder for Moxfield sends the card list of the deck you are viewing to the Commander Spellbook API (backend.commanderspellbook.com) in order to look up combos. That request contains card names and quantities only. It is not associated with you, and no account information, cookies, or credentials are included. Nothing else is transmitted. The extension does not collect analytics, telemetry, browsing history, or any personal information, and no data is sent to the developer or to any third party other than Commander Spellbook. Results are cached in your browser's local extension storage for six hours to reduce requests. This cache never leaves your device and is removed when you uninstall the extension. Questions: info.manaburn@gmail.com info.manaburn@gmail.com Category: Games & Entertainment (or Other, if that fits the current list better) Tags: mtg, magic the gathering, commander, edh, moxfield, combos, deckbuilding First public release.