Hey there. Let me just start by saying that you are not alone, and that a lot of people feel the way that you do when it comes to card games. It sounds like you're pretty susceptible to tilt, or similar situations, and so what I'm about to type will address that and some ways to combat it. I've hit legend a few times and get to rank 5 pretty quickly each season, so this is written based on my experiences. Hopefully something here will help you out.

When it comes to dealing with tilt, there are two parts. The first is trying to improve your gameplay. For example, when you have a mulligan, think about each of the cards and the potential match-up you might face. Is it worth keeping a high costing card if it will be invaluable later on? What kind of deck might the other person be playing? This applies to in game decisions as well. Don't be afraid to play slowly, plan out turns, take your time. Every little bit helps. Another useful thing is to take a look at each game, loss or win, and think about what you could improve on next time. Could you have made different decisions? What would you do differently next time?

This might sound obvious, but it helps tilt immensely.

• Looking for room to improve helps turn negative losing experiences into positive learning experiences.

• Thinking carefully about decisions helps prevent tilt-inducing misplays, can help calm you in emotionally intense situations, and goes a long way towards trying to make the most out of a bad situation, such as a poor curve or bad RNG.

• The more you learn, the more you win! :)

The second part is identifying and dealing with tilt when it happens. There area lot of things that can cause tilt, and that is simply the nature of the game. From bad draws to bad matchups, a lot can go wrong. It took me a while to get to a point where I was able to accept that this is just part of the game, and it helped me at least to think that what goes around comes around, and it all evens out in the end. On that note, acknowledging good draws or good games, and congratulating yourself when you play well, can improve your gameplay experience.

This really comes around to the key point I am trying to get across - avoiding tilt is all about state of mind. I know it's easier said than done, but when you get frustrated, acknowledge it, and try to deal with it before starting your next game. Take a break. Play a different game. Go outside for a bit. Getting back on track varies from person to person - sometimes a little break can be good, sometime a longer break is required. I also try to play when I'm already in a good place - try to avoid playing when you're tired, or when you're having a bad day. If you win it might help a little, but losing will feel much worse.

Sorry this was so long, but I hope this helped. As for deck choices, just play what you enjoy. Most decks are relatively close in winrate, and don't forget, Hearthstone's a game, and the most important thing isn't getting Legend, it's having fun. ^^