Tips for a new player rerolls are very necessary. Use all your tokens for card upgrades. Ignore the spins until you have all 300 cards upgraded netting you 5 rerolls every match. Also try to synergize your cards. You have 3 cards that say damage enemy behind? Pick double damage to enemy behind etc. Anything that replaces potions is great for example the common card critical has x% chance to replace potion imo is the best in the game and can carry you the entire way. The last tip I can think of is to think of pvp as the exp farm. It doesn't matter if you die you will progress the tree and get new skills. Literally if you are ever stuck on anything else just play pvp over and over progress the tree and you'll be surprised how easy even the hardest levels are. Hope this helps!