I play currently Paladin well. I just stick to playing tempo and it works well. Few card draws do help the strategy. Concentrate on 1,2,3 drops and tempo swings.
But I play very poor Mage and Warlock which are supposed to be the best classes now. Any tips how to play those classes well in the current arena meta?
Draft a bit greedy with mage, since you probably have removals, pick cards like elemental phoenix 4 mana, pit crocolisk, primordial drake, 8 mana worm that spawns little worms upon death and lots of good 4-7 drops
As warlock either draft as a zoo or try a bit more control, in arena epic warlock removal spell that costs 5 mana deal 2 damage and if it kills summon a random demon is really good right now, since there is no harmful demon on the current arena pools, try to draft healing a bit but if the pick is something like earthen ring far seer vs 2/3 2 mana deathrattle gives armor vs stonehill defender prioritize stonehill defender since warlock has hand mechanic as well, you may never know which spells you will pick up next