[2020] Deck Editor

Does anyone have the definitive guide to the deck editor? I know how to filter using the buttons and combinations, but I am wondering about the unwritten wildcards. For example, "Q<4" to select those filtered card you have less than a playset of.

I was trying to remember the text Icon of Ancestry, and I typed in "ICON" for a search. I did not expect the result. I have been trying to determine what exactly was being shown and could not figure it out. My best guess is there is either multi-language translation filter, or some kind of keyword set that I need to learn more about. Hence, my question.

Thanks to anyone who has information about the Arena Deck Editor. :)