Hello there!

Just a question, do i have to buy 3x core sets to get 3x of every Invasion core card or there is something like an expansion set containing the missing cards?

Thanks in advance!

Yes, you need to buy three core sets in order to get a playset of cards (or find one on Ebay/craigslist).

Yup, and it works out great if you have a group of friends to play this with, because you can each just buy the core set and then "trade" the cards you need to each other. Same with the expansions, its like your paying for one and getting a full play set of cards!

Its just something you need to work out with your group, overall i love the idea of a LCG.