Tracked precons from your collection — the cards sit assembled in their boxes. The preview is read-only; create a copy into your decks from inside the preview.
Four random cards from the main deck. Click up to 2 cards and Mulligan to swap them for new ones.
Paste a deck export — JSON, or text lines like “3x Name” (optional section headers Legend:/Runes:/Battlefields:/Sideboard:). Or pick a file.