go into hearthstone battlegrounds and select a hero that gives you a lot of gold and play mechs. then use the plus gold magnetic mechs as much as possible and try to race to level 4,5,6 and watch the majority of the field keep up with your tier lvl. especially watch the gnome that has to pay extra gold to tier up and refresh the tavern. it's impossible for them to field the mobs and teir up with you, but they will, every time. the one hero (treant bitch) that gives two gold when you tier up can let you level three times if you get enough gold from the mechs or the bristlebacks that consume a blood shard for 4g or the snake.eyes hero that rolls a 6 turn 1. in regular hs you'll never see certain decks from the meta. if you play non meta decks you'll play against a disproportionate number of non meta decks.
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