First, click on your Hero button in the bottom of the screen, go to difficulty, and make sure it is still set to Normal or Hard. I am assuming I am misreading your “Epic” difficulty, but I think its worth checking that you are not playing a “Warlord” difficulty setting.
When you edit your team, consider reordering your troops to: Templar, Treant, sabertooth, hero. With both the Treant and the Sabertooth competing for Green and Blue, it could hurt your charging of abilities early in the game. What color weapon are you using?
Right now your troops cover blue, green, and brown, leaving red, purple, and yellow matches to not benefit you. So you may want to replace the sabertooth or the treant with the purple knight. Then run a hero weapon that is either red or yellow.
Early on, mana generation can be slow, so using multiple colors helps, in my opinion.
I know when I first began, I lost some matches, but the hero keeps gaining experience. That allowed me to unlock some more useful weapons, and gain some stats on the hero.