1) Install peerflix

npm install -g peerflix  

2) Install LinCastor
3) Install VLC (it must be installed at /Application, otherwise peerflix will not properly launch it)
4) Open LinCastor and click on add new scheme
5) Set scheme(s) to magnet
6) Select Shell Script and paste:

#!/bin/sh
/usr/bin/osascript -e 'tell application "Terminal" to activate do script "/usr/local/bin/peerflix \"'$URL'\" --vlc"'
exit 0  

7) Open your preferred browser, find a magnet link and click it.
8) Enjoy :)