i am new to this game and community.
But i found this site on my search for some campaign quest solutions and found nothing to solve 5-2.
So here's my way got it just this moment:
all cards level 1 except Healing...
3x Sweety Pirate (for the 4 Enchanted rule, a bit of dmg and collateral damage ^^); Lord of Templars (yeah it's Epic, but i think this is a key card there); Healing (mine is level 29 although level is not important); last but not least Pit Trap (to hold off one of the Crusaders)
mid cards: Lord of Templars, Healing and Pit Trap (3 uses left) and one Crusader down ( second still full hp).
end cards should be all enemy cards and on your side, Lord of Templars and Healing ) took me 88 seconds to beat it this way. Repeated it 2 times, 2nd try: 88 secs; 3rd try: 88 ,to confirm it wasn't luck
but then i realized even though the time would run out you would still win cause you had more hp left xDfor those who didn't solve it yet, hf gl ^^
greetings Katatonia