Getting into Pox Nora is hard as newcomer. Even as veteran or old player you will get problems coming back because Desert Owl added a lot of new cards to the game and rebalanced the old ones (Zombies play entirely different now to what they did 5 years ago). But these changes are, so strange it may sound, for the better. the game feels a lot more balanced as it did before the owner change. In terms of both rewards and card balance. A lot of the older cards that were terrible have been improved. i won't say that every card is viable because that's hard with over 1000 cards. But the cards are balanced were they stand and even a seemingly terible card can be used in some cases.
Rewards are generous, I said this more then often enough, you can get tons of gold each day just from playing against the AI. Quests can be solved both for PVP matches and AI matches (some not because they directly state you have to play/win a pvp match but these are a minority).
If you play against other players, you get experience tokens (used to level up cards) if you play AI matches you get free cards from the faction you played in that match. if you played an Ironfist Stronghold deck, you will get an Ironfist Stronghold card. this system works perfecly fine, you play with your favourite faction and get rewarded with more cards for that faction.
Liek many other games of this type you can now also destroy cards and get shards for it, then use these shards to buy new cards you need. This makes building your dream deck very easy. In the recent week I imrpoved my Zombie deck a lot.
However, there still stands the point that new players will literally have no clue about the game. There is a detailed, playable tutorial that helps a lot but this does not help to consider what cards are good in what deck. For that reason I point to the forums of the game. I asked to improve my zombie deck and got some very useful tips: https://www.youtube.com/watch?v=wxg4kLSl8jo
These tips helped me to remove terrible cards from my deck and select the right cards to put into it, they also gave me tips how to properly play the zombies.
There are multiple threads that adress decks of different themes and give example how to build these decks. I want toshow this general deck building guide, it does not exactly state what cards are good but it adresses the major aspects that every deck shoudl have.http://forums.poxnora.com/index.php?threads/basic-battlegroup-guidelines.99/
It gives detailed information what types of different champions you need, what kinds of spells you should put into your deck and what counters you always need for your deck.
Besides that it would also be a good idea to check the 20 training decks out that the game offers. You can buy them for a minor amount of gold (and each week soem of them are free). They give you a good idea what types of card you need for that deck theme (for example a paladin oriented deck) and help you to test out the synergies of the cards.
Besides that tehre will always be an barrier. Old card games will have this problems because there are so many cards in them and it is not possible to learn them all in a short amount of time nor to understand which of them are good or bad.
If I look now at Yugioh, a card game I loved in the past, I can only shake my head. the game has chosen the the path to speed up things. The game gets faster with every expansion, I remember the days when it was a miracle if you could play a special summoned monster in one of your turns, now people pull this of int heir first turn and every turn after that. it's gotten so easy to summon a very powerful monster. And with the new pendulum system it's getting even more rodoculous. You can summon an unlimited amoutn of mosnters on your turn with the new pendulum system as long as you fulfill the requirements (which are easy to fulfill).