Pirates 2019 Trading Cards

Ahoy!
Get yourself a pack of the 2019 Pirate trading cards!
20 cards in the full set, and 5 cards per pack.
Each pack has 4 commons and one of the uncommons, rares, or ??

If you collect all 20 cards in a set,
(10 common, 5 uncommon, 3 rares, 2???)
You get a free common slot in the next set of cards!