Deck Diff

Paste two decklists, one card per line like 4 Lightning Bolt. Cards both decks run land in In common — and if the copy counts differ it's highlighted (e.g. 4 / 3). Cards only one deck runs show in that deck's column. Maindeck and sideboard are compared separately: put a Sideboard line before your sideboard, and each row is tagged MD or SB.