First of all, Hadarot has a funny pixel Art style which is really cool and also card abilities which are quite fun and random.
In Hadarot you'll fight religious and mythological creatures in each run. At the start, you select one of the 2 character to start with, who have different decks, however, you will be able to buy and sell your cards, improving your deck over time.
There are 5 types of cards, but the 2 most important are troops cards and passive ones. With the first one you can attack the enemy (The cards that you can see in the left of the table, like the ghost). Passives are card that apply different effects for the rest of the run, like making animals cards stronger or cards that have guns shooting twice.
In conclusion, Hadarot is an interesting roguelike deckbuilder that you should try, since the Demo version is free on steam, you may find a real gem!