You can watch Jake’s update video( if I’m not wrong there is also a video with him explaining Advance mode) about how the game works. You can’t really make an op card deck since your opponent’s card deck is unpredictable.
How do you even play it (any tutorial via YouTube or any advantages/how to win and do and don’ts)
1.1 I would recommend to assemble deck with elemental damage that is the highest. The most important thing is to make sure that the lowest elemental damage cannot be challenged with opponent’s card (placing them in the corner, forcing to attack them based on the highest elemental damage) and once that card is reversed, it will be much easier to regain it. 1.2 Other thing that can be done is to place a card that can obtain 2+ cards at the same time if you have the opportunity to do so. 1.3 Make sure to lock down the spots to get an advantage against your opponent. It will give an upper hand as the way to win the game is to gain high count of card slots in the battlefield. 1.4Pixel Worlds Official YouTube channel is where you can find in-depth look at the card game update as well as visuals of how it looks like.
Is there any prizes/anything if you won?
At the moment, there is none. All we can do now is disenchant cards, gain pixel dust and create more valuable cards or the ones you do not have.
Tournament when?
There is no specific date as of yet.
Are the cards I bought at the store permanent?
Yes. You can get the same card multiple times but only two same cards can be used on a deck (basic and advanced one).
I have played a bunch of card games before. All you have to do is understand the basic concept of it to start creating strategies with the deck you have.
I can think only of Gwent that is somewhat similar. Other card games I was referring to are mostly to exercise your thinking so any kind of is good enough (UNO, Rummy, War, etc.)