I'm really bad at this game, but your set up looks like something I would do. I haven't figured out all the math yet, I try to maximize my summoner bonus : you only have two cards using the bonus. I said that and my win rate is under 40%, so I'm probably wrong. I like using Cerberus as a tank too, he is hard to kill.

The other guy set up was terrible : his number two and three cards cannot attack straight at the gate, you cannot win if you got two cards doing nothing during the first round. Maybe there is a strategy I don't see.

Keep up playing! Maybe one day I can reach Bronze II myself.