Emblems: How many is too many?
I have a question that came up during FNM last night and because I am still learning about what to do when the CR does not address something, I was at a bit of a loss. How many of each emblem can someone have attached to him/her/themself? I know that for certain emblems, like the Gideon of the Trials emblem, one is usually enough, but can a player have more than one, like the Chandra, Torch of Defiance emblem? I would assume no to this because, like the Legend rule or the Planeswalker uniqueness rule, emblems result from unique sources and having more than one would result in the new overwriting the previous. Also, would say an Elspeth, Sun's Champion emblem result in a uniqueness challenge to an already existing Elspeth, Knight Errant emblem, or would these stack because they are different effects?
Please and thank you for helping me figure this out as I study for my Level 1 exam.