Which Commander decks can you build?
Paste a list of the cards you own, or a CSV export from ManaBox, Moxfield, Archidekt, Deckbox or Dragon Shield. MTG Binder finds the legendary creatures in it that can lead a deck and scores each one against its average EDHREC decklist: how many of its 100 cards you already own and about what the rest would cost. Nothing is saved and you don't need an account.
With a free account you can keep your collection, scan every commander you own across budget, upgraded and cEDH lists, and build a buy list for the missing cards.