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Please, Tell me, if I update one card and then I get another, can I attach a level 2 or 4 card to another level 1 card? and so

Yes you can. As long as they are the same edition you can combine any level with any level and get a result that is the sum of the two levels XP.

Thank you so much! :3
Now I managed to raise the level cards, but they do not come out in battle with the level they have, I guess it's because my invoker is level 1, what sadness :c