Heck yah you can! This is one of my favorite pieces (advanced filters were a weekend project I did for fun).
You can use "owned" or "q" to filter on how many you own
Ravnica Allegiance cards you have a playset of:
e:rna q=4
Ravnica Allegiance card you have less than a playset of:
e:rna q<4
Or let's say you wanted to see what's needed to complete your Common/Uncommon playset of Ravnica Allegience:
e:rna q<4 (r:c or r:u)
I'll post more when I get some time. :D
Oh. But I should note. Because I didn't want to bust the existing functionality for a pet project, the text search is
combined with the button filters. So if you want to see things you don't own from a text search, remember to pop in to the Advanced Filters section (the button by the colors that has sliders on it) and make sure "Not Collected" is turned on.