Some maps are literally impossible depending on the RNG with dark moon faire. It is not possible to win certain maps that have all chests spawn on the AI side when their hero is Old Murkeye and March of the Murlocs is active. Because the AI already cheats with gold and spawning the same unit repeatedly, it enters into an endless loop of spawning old murk eye and double murlocs such that your opponent has about twenty minis on the map in the first five seconds and close to fifty in the first 10. Not even a full AoE team can counter this since the AI is also spawning abominations every ten seconds or so too.
Mor’Ladim and Darkmoon Faire is impossible.
Some quests seems to be imposible BUT there is always a way to complete the quest.
Use UNBOUND minis to go directly to the chest, no matter how far is the chest.
I also want to share with you that is very important improve your minis at least to inusual (green) or rare (blue) in order to complete the quest more easy.
I haven’t had any problems with the tasks or the maps so far. What can help with Murlocs is to make sure you have a dragon and pup eggs with you. They’ll wipe everything out in seconds.