Jatill, after a little bit of studying, I've seen what follows - and I write it here for all modders even if probably I'm spoiled something already knonw. Please, correct me if I'm telling something wrong.
When you add a new card, you have 3 colums that are related to the expansion and rarity.
They are:
Column E* (Expansion): this column mainly tell you where the cards are located in the deck editor where the "first print" of the card may also be found in the sealed deck. They are:
0800h = unlimited
0020h = The Dark
0004h = Arabian Nights
0100h = Legends
0008h = Astral
0040h = 8th Edition
0002h = Antiquities
0080 = n/D
01000h = Tokens
Column D* (rarity): this colums tell how rare a card from previous column is. 1 = common, 4 = uncommon, 2 = rare... and 3? Maybe uncommon 1 for small sets? I don't know.
01000h = Tokens
Column CD* (Expert rarity) The name here is tricky because, instead, it tells you if a card has be re-printed in other sets (eg. revised or chronicless). Some cards that have never been re-printed, as Juzam Djinn, have 0h that means nothing. Others instead have a different ID.
As far as I've understood it, using SkyMagic editor informations, there are five numbers followed by "h".
Eg: 00000h. Each number represent a re-print set: from left to right, 8th Edition, Chronicless, 5th Edition, 4th Edition, Revised. I you fill any 0 of your choiche with a number, it will mean that a card has been re-printed in the set that corresponds to the replaced zero.
The values are:
5 = common
1 = uncommon
7 = Special Chronicless (probably uncommon 1??)
9 = rare.
So, if you set a card as 51119h, you are telling to the game that, from right to left, the card was rare (9) in revised and then it has been reduced to uncommon in 4th, 5th and Chronicless (1) and turned to common in 8th edition (5).
Sadly, this means that I was wrong when I claimed that Astral cards may be cloned wherever we want, but it is still possible to take any promo or Astral card (or any of the cards made from us), mark it officially in the deck editor as Astrall card and then "clone" it into Revised, 4th, 5th, 8th edition or Chronicless for sealed deck purposes.
*letters are related to the columns in Microsoft Excell
Now, i was also thinking that, since 5th edition set is very uncomplete, we could dismiss that set and recycle its slot to make an all-random sealed deck game, with all available cards in one single set. You wold never know what you shall get!!!
Do you like the idea?? I do a lot!!! 