Adapted from 'Combined Points for Trello' extension (see https://chrome.google.com/webstore/detail/points-for-trello-combine)
This extension adds:
1.) Reach, Impact and Effort priority badges to Trello cards. Values are added by including [R:1] [I:1] [E:1] in the card title.
2.) A "Show Easy" button which highlights the 3 cards with the lowest effort assigned that don't already have members attached.
3.) A "Show Leaderboard" feature that shows the number of cards owned by each attached user per active list.
4.) A small icon to "card detail" pop-ups that displays the card's creator.
30/05/2018: Updated for compatibility with Elegantt for Trello.