Edit as Text
Edit your whole deck as a plain list — paste, tweak, apply.
Opening It
In the editor, choose Edit as text (in the toolbar, or the ⋯ sheet on mobile). The deck renders as text, one card per line under Commander, Deck, Sideboard and Maybeboard headers:
4 Lightning Bolt (2XM) 129
Set code and collector number are optional. Choose a Group by (type, mana cost, colour, rarity, category) to add // Group (n) comment lines that make a long list readable — they are ignored when you apply.
Applying
checks every line and shows the diff: additions, removals, quantity changes and printing changes. Lines that cannot be matched are reported by line number — nothing is ever dropped silently — and you can apply anyway with those lines skipped. The whole edit is a single undo step.
Printings
A plain name line never changes the printing of a card you already have. Add a set code and collector number to swap a printing from text; the categories and notes on that row are preserved.