Deck tools

The tools live in the deck screen's two-tier deck bar, each in its place:

• Data tier → Value (what the deck is worth and which cards drive it), Insights (the deck at a glance, opening-hand odds, mana curve and mana base, types, colors and rarities) and Bracket (the official Commander power-level brackets, Commander decks only).
• Tools tier → Playtest — goldfish the deck interactively; the Simulate hand lab opens from a tile inside Playtest — and Build sessions for assembling the paper deck.
• Ideas tier → EDHREC, Mana base and Staples, plus Blindspots (what the community runs that the guides never suggest) and Combos (what the deck can already do and what it is one card from doing) — all in Ideas, on Commander and Brawl decks only.
• Legality isn't a tab at all: it's the chip in the deck header, the Studio's Legal tab, and a banner on the web deck page.

What works on which deck

• Your decks — everything (Bracket, EDHREC, Staples, Blindspots and Combos require a Commander-format deck).
• Commander precons (read-only) — Playtest, Value and Insights work; Build, Notes, History, Bracket and Ideas are hidden until you clone it into a deck of your own.
• Secret Lair drops — Value and Insights only (a drop is a product, not a playable deck).