May the wind under your wings bear you where the sun sails and the moon walks
Uses SWI-Prolog, Pengines, and meccg data and images to allow users to run queries and view matching cards, one at a time, with backtracking in the case of multiple matches.
Importantly, the query starts with card(C) and any further constraints are up to the user. You can include any predicates supported by the Pengines sandbox.
A demo of this is hosted at http://jekbox.com:8000