Finally custom cards are working! check the example card in files for general formatting. Here are sigil id's (more sigils later):

And the general structure is a number in one line:

Line one is card health;
Line two is attack;
Line 3 is sigil id;
Line 4 is blood cost(wouldn't display on card, add to image yourself);
Line 5 is bone cost(wouldn't display on card, add to image yourself);
Line 6 is card name;
The .txt file should be called "CardData.txt" and be accompanied by icon.png/icon.jpg/icon.jpeg all the players should have same custom card or it will just result an error and you being unable to play!