Why are some of the cards unlocked later in the game weaker versions of already unlocked cards? There's a few that I'm wondering about, but especially the second ranged ground unit that has 1/1 stats when the first ranged ground unit unlocked much earlier has 2/2. There's also a ground unit on the 5th page of cards, 2nd on the bottom row, that has 3/1 stats and no special ability. By the time you unlock it you have several units with much higher stats. These late-game low stat cards just seem to make the game harder since they lower your chances of getting the better cards.
BUG REPORT
My first 3 card draws were all the unit that's on the 5th page of cards, 3rd in the top row (has 4/6 stats) and the unit never spawned on the battle field. It was just the starter 1/1 units, and no other ones until on my 4th draw I selected another unit and it started spawning as expected. I've selected the same card a few times in other rounds and have never seen it on the battle field.
Anyone know what the basement level 3 upgrade does? It says '...access level 3 basement and visitor's mood'. Purchased the upgrade and can't see anything unlocked. With all the broken english in the game, I'm wondering if it's just some sort of passive visitor mood improvement, but not sure why it adds another basement