10600 arcane dust earned

I noticed this the other day on my na account where i got 3200 dust earned.
Now on my eu account i got the message “10600 arcane dust earned”
It seems very generous but i am not complaining lol.
Where does this come from i honestly have no clue.

Maybe it’s this



Ah ty that makes sense and must be the reason.
I had over 80 packs from various expansions and classic on my eu account that i didnt open for years and i did open them all a few days ago. Well thats very welcome now i can craft another deck yay.