Thanks a lot for the feedback and compliments! 🙌
To clarify a bit, the cards you receive in hand are selected at random in your deck; each resource you gather on the island adds one additional card of the related color to your deck.
Each virus that you let through adds a virus card to your deck as well, so it increases your chances to get one in hand in the next villages... and 0-valued cards don't help you win tricks!
Hope this helps!