I have inserted my collection using the format <number><space><card name>. The card names are precise, and even match the format of the output decks. The capitalization is correct. However, with the box marked "Use All Cards" checked, it completely disregards my collection of cards that I've input, and with the "Use All Cards" box unchecked, the program just crashes.  I have "No Restrictions" checked. I'm on Windows 11. The program opens fine, and will output a deck from all Magic cards, apparently, but will not use my list that I've inserted. I have downloaded the Mono and gtk that the installation instructions say are required.

Got it junkerking! Thank you so much for reporting. Im on it!

Make sure no white lines are included at the end of the list of the input collection if you have the time, since it’s very sensitive. Im going to replicate your case and see if I can catch the bug.

Also, if you have newer cards make sure to press “download latest cards”. That may take a while but it may solve it.

The input collection actually works fine for me but, as I said, it is very sensitive. Adding a single space in a card's name results in the program crashing. I intend to create a proper and more robust collection importer, but this is the current state of things.

You could try inputting a fraction of your collection, to test it out. If it fails it means a card's name was probably misspelled among those cards so it should be easier to pinpoint it. By inputting only small fractions of your collection at a time you will be able to confirm if the system actually works or if there is another problem. For me at least the input collection works but its extremely sensitive and fragile.

Try inputting this as your collection, they worked for me. You should get a deck with those cards as output:

4 Midnight Arsonist

4 The Brothers' War

4 Shifting Wall

4 Karn, Legacy Reforged

4 Powerstone Shard

4 Welding Jar

4 Candelabra of Tawnos

2 Bone Saw

4 Scale of Chiss-Goria

2 Stonecoil Serpent

4 Midnight Arsonist

4 The Brothers' War

4 Shifting Wall

4 Karn, Legacy Reforged

4 Powerstone Shard

4 Welding Jar

4 Candelabra of Tawnos

2 Bone Saw

4 Scale of Chiss-Goria

2 Stonecoil Serpent

4 Sanctum Weaver

4 Redtooth Vanguard

4 Whip Silk

4 One with the Kami

4 Fire Whip

4 Careful Cultivation

4 Ordeal of Purphoros

4 Fiery Bombardment

4 Armor of Thorns

I think I understand the issue. It happens when you write just the name of the main face in a dual face card. Dual face cards should be written like this:

4 Civilized Scholar // Homicidal Brute

Meaning : <amount><space><face A name><space><double slash><space><face B name>

Cheers! :)