Board Thread:Fun and Games/@comment-32740701-20170801062124/@comment-28559763-20170801063939

Every chest has a chance of containing a legendary card once you reached Arena 4 (Even Silver and Free chests)

Getting a legendary from Giant Chest means you are lucky, since it only gives less than 10% chance to get a legendary

(Btw this should be on question and answers board, just saying)