Seeing it at first glance I knew you would win.
Your opponent didn’t understand the ruleset and you have wood nymph and Goblin Psychic to heal your frontline completely.
Your opponent lost the game by using 3 frontline attackers in a row with no healer in place.
You also have a blast from your range attacker.
I think what made you thought of loosing was the legendary Dragon Summoner.
Nice strategy 👍🏾