This is very nice of you, I've found out about the resurrection of this game only yesterday and insta-DLed it because I remember loving it back in the day, so any help growing back my collection is much appreciated.
As for the priorities from the cards you could offer, I'd say
UR/R = 1. Amii Monument
UC = 1. Burrower
Commons = whatever you can spare that you find more useful to start back farming the pve campaign, still have to recollect my memories about it, I remember I was heavy on nature/fire player in the first 2 tier, splashing later for a 3rd color in many maps.
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Ingame username: AhRiMaN-MK
Thank you.