Splinterlands ~ Water Battle Analysis ~ 26 mana

I'm going to analyze this battle I had today. With a medium mana and a summoner of water.

The training you use:

For this battle I average 26 mana against an opponent who I thought would use fire. I was wrong I use water too.

My choice was the summoner Kelya Frendul to get my speed and defense increased, that way I would have the upper hand.
In first position I placed Serpent of Eld for his ability to dodge attacks.
In second position place DeepLurkell for the power of it and to hunt the weakest monsters.

In third and fourth position use a magic monster to have alternatives and another opportunistic monster to strengthen DeepLurkell.
Finally place Angelic Mandarin who is a flexible card that attacks first position and resistant in the rear.

After the first round I managed to take out his monster from the rear with no casualties and with barely any loss of protection from my magic monster.

In the second round I lost my magic monster but I killed another one of his monsters, this time an opportunist.

In the third round I lose one of my opportunistic monsters but I have removed the protection of his rehab monster and also his first line begins to weaken.

In the fourth round I continue to weaken his first lane with hardly any damage.

In the fifth round I break his first lane and also take out the rehab monster. Now I've won, it's just a matter of time.

If you want to see the end you just have to follow the link

https://splinterlands.com?p=battle&id=sl_4866cb3d2d6bd2db70dc2abf95247f8e&ref=tokutaro22

What do you think?
What would you have done differently?
What is your favorite combination for this mana?

Do not hesitate to leave your criticism and comments. They will be grateful.