Greasy Fork is available in English.
Shows the numbers of cards, doubles and legendaries, next to HSReplay build names, that you need to complete them [#n=needed/#d=doubles/#★=legendaries]
About
You can use this for general builds browsing or use Hearthstone Deck Tracker to sync upload your card library to hsreplay.net, then visit https://hsreplay.net/decks/ and click on 'Limit to my collection', vary the amount of dust you want to spend and it will show you possible builds you can make.Example
This script will show the number of cards you need to complete any build, example:Odd Paladin - 6n ( 4d / 1★)
This means I would need 6 cards total, 4 of them are doubles (2x) and 1 is a legendary.
As 4 out of the 6 cards are doubles, only 2 are unique, lower unique cards mean it's easier to replace them with substitutes (mulligans).
