Legality & Ideas
Format legality checks and EDHREC-powered recommendations.
Legality
The Legality chip in the deck header validates the deck for its format: banned cards, copy limits, color identity (against your commander), deck size and format-specific rules. Tap it for the breakdown — problems are listed card by card so fixes are one tap away.
Legality rules exist for six formats: Commander, Standard, Pioneer, Modern, Legacy and Vintage (where restricted cards are validated as 1-copy warnings). Decks in other formats simply don't show a legality chip.
Ideas (EDHREC)
The Ideas tab brings EDHREC data to your commander: recommended cards, category staples, and mana-base suggestions. Recommendations aren't hidden when you already run them — instead, cards in your deck get a green ring (with a Remove shortcut) and cards you own show an ×N badge, so the list doubles as a checklist. A great second opinion when a brew stalls.