The format explained for somebody who has never played it: one legendary creature leads a deck of exactly 100 different cards.

Let the site build a deck with me

Session Zero asks a few plain questions about how you like to play, then suggests commanders and decks that suit the answers. No account needed to try it.

I already have a decklist

Paste it from Moxfield, Archidekt, Deckbox, ManaBox or just typed out, and the site reads it and finds every card.

How powerful is my deck?

Brackets are how players agree on how hard their decks try to win, before the game starts. There are five, and the brackets page explains each one in plain words. A reading of your own deck is coming once we trust its numbers.

What does this word mean?

Every term the game uses, defined in plain English with an example card wherever one helps.

What kind of deck is this?

48 archetypes — whole game plans, described by the way the deck intends to win.

What is this deck built around?

131 themes — a creature type, a single idea, a colour pair.

What does one card actually do?

195 tags — one job a single card can do, in a vacuum.

All 3,453 legal commanders, A to Z.

What can I buy ready-made?

169 preconstructed decks you can buy and play out of the box, each with its full card list.

Help — Commander Nexus

Start here

What is Commander?: The format explained for somebody who has never played it: one legendary creature leads a deck of exactly 100 different cards.
Let the site build a deck with me: Session Zero asks a few plain questions about how you like to play, then suggests commanders and decks that suit the answers. No account needed to try it.
I already have a decklist: Paste it from Moxfield, Archidekt, Deckbox, ManaBox or just typed out, and the site reads it and finds every card.
How powerful is my deck?: Brackets are how players agree on how hard their decks try to win, before the game starts. There are five, and the brackets page explains each one in plain words. A reading of your own deck is coming once we trust its numbers.

Look something up

What does this word mean?: Every term the game uses, defined in plain English with an example card wherever one helps.
What kind of deck is this?: 48 archetypes — whole game plans, described by the way the deck intends to win.
What is this deck built around?: 131 themes — a creature type, a single idea, a colour pair.
What does one card actually do?: 195 tags — one job a single card can do, in a vacuum.
Who can lead a deck?: All 3,453 legal commanders, A to Z.
What can I buy ready-made?: 169 preconstructed decks you can buy and play out of the box, each with its full card list.

Show me around

How do I replay a tutorial?: Every major screen walks you through its controls the first time you open it. The ? button in the bottom-left corner replays the tour for whatever page you are on, any time — including this one's neighbours. Signed in, Account → Tutorials lists every tour, plays any of them on demand, and turns them off or back on.
Is there a keyboard shortcut for search?: Press / anywhere and the cursor jumps to the search box on whatever page you are on. Esc closes any suggestion list.
Do I need an account?: No, to look. You can browse and search every card, commander and preconstructed deck, open anyone's shared deck, and run Session Zero without signing in. You need an account only to save something — your own decks, and your collection.

Something is wrong

A card is missing, or its details are wrong: Card data comes from Scryfall and prices from MTGJSON, refreshed every day. If a search finds nothing, the results page offers a Report the gap button that tells us exactly what you looked for.
What changed recently?: Every change to the site is written up, in plain language, on the changelog.