No such thing as guaranteed champion.
I never have enough shards to get these so called guaranteed champions and after spending a lot of money on game and not getting anything for it I am done. I farm everyday. I do all the easy daily's everyday. Cannot ever get advanced done. Too difficult to do but get what I can. Do factions and dungeons everyday but cannot advance far. Impossible to get all these champions in Faction Wars upgraded. Not enought resources. Cannot get 6 Start Artifacts or Accessories. Played Brutal and Nightmare in Campaign Battles repeatedly and played same stage at least 20 times each and stil cannot get 6 Star items. About ready to quit game or play it way less. No fun if you cannot advance in anything.