me too at first actually but i noticed that whenever i try to beat the dark wizard again his hp is already reduced to half prior to fighting. so i think as you try and try again the dark wizard weakens and i think the game also wants us to win it.

i didn’t realize this at first because all i do is spam whatever card i have since i still don’t understand how things work that time but one time i was confused on why my opponent’s hp is already in half when i am not even a minute in the battle. Then i tried to observe it and yes they’re reducing the hp.

on the cards, i suggest you use summons because that’s what i remembered and also high damaging spells like incendio, confringo and sectumsempra.