Board Thread:General Discussion/@comment-72.218.53.240-20130214140641/@comment-5947652-20130216171402

Keep doing the missions and you will eventually get the rarity 3 you want (25% chance to get a cache, 25% chance to be rarity 3 from the cache, although you will seem to get it more often than a 6.25% chance)

The space bridge gives any card with the exclusion of the Event Cards but the drop rates are very very low.