The key here is to focus only on 1 or 2 faction. Buy or rent few cards and climb the ladder! For exemple you can play fire and rent Fineas Rage 0.1 DEC/day and Kobold Miner also around 0.1 DEC/Day and try with high mana cap #1/Living Lava #2/Fineas rage #3/Chaos agent #4Scavo hireling #5/Serpentine spy #6/Kobold miner #/6 Tenyii striker
You can also try to rent Tusk the wide for a good tank with magic protection 0.3DEC/DAY
I wish you good luck!