Just tried importing a list of cards into an inventory, and found that these weren't recognized:

Bösium Strip Chicken à la King Dandân Déjà Vu El-Hajjâj Ghazbán Ogre Ghazbán Ogress Ifh-Bíff Efreet Jötun Grunt Jötun Owl Keeper Junún Efreet Juzám Djinn Khabál Ghoul Legions of Lim-Dûl Lim-Dûl the Necromancer Lim-Dûl's Cohort Lim-Dûl's Hex Lim-Dûl's High Guard Lim-Dûl's Paladin Lim-Dûl's Vault Márton Stromgald Oath of Lim-Dûl Ring of Ma'rûf Sauté Séance The Ultimate Nightmare of Wizards of the Coast® Customer Service

Chaotic Aether 1996 World Champion "Ach! Hans, Run!" B.F.M.

Evil Presents Fraternal Exaltation Fruitcake Elemental Gifts Given Naughty/Nice Proposal Robot Chicken Season's Beatings Shichifukujin Dragon Snow Mercy Splendid Genesis Yule Ooze

Thanks for reporting, will take a look!

I was able to get some of these to upload by dropping the diacritics off the letters like so:
Dandan
Ghazban Ogre
Jotun Grunt
Junun Efreet
Lim-Dul's Vault

However, I was unable to find a work around for:
The Ultimate Nightmare of Wizards of the Coast® Customer Service

Was anyone else able to find a way to import that card?