This is more than I thought
Good, I thought that because of the battles I had won at the beginning this was easier.
But I am realizing that there are very good people here and they know very well what they are doing, so I am losing many battles.
So I will investigate and read what are the best cards to put according to the mana they give you for each battle and to be a worthy adversary, because if I do not do it I think I can climb to the top positions
I reviewed a couple of your games and can see one of the mistakes you making is putting a melee attack monster in second position that can't attack. In most cases its better to use a card that has reach (green claw) or magic in second position.
For basic strategy: Large health melee in front / Magic in the middle / Ranged in the back. If mana allows put as many magic in your line up as possible behind the 0 Mana chicken.
The water splinter with its magic will win allot of the times in the lower league levels. I noticed you didn't have a Sea Genie yet so I sent you one. Try the water splinter with Sea Monster in front / 0 Mana Chicken / Sea Genie and some range attack in the back.
Good luck, keep at it.
Thank you very much for the letter and I am doing what you said and the truth is that I am doing very well now