An implementation of Frank Karsten's deck aggregation algorithm described here: http://www.channelfireball.com/articles/magic-math-a-new-way-to-determine-an-aggregate-deck-list-rg-dragons/
$ go get github.com/malthrin/mtg-aggregatedeck
$ $GOPATH/bin/mtg-aggregatedeck
Open a browser at http://localhost:8981/