tip for three headed dragon, get a lot of coffee, equip matt with casual clothes, and ice weapon, fire resistant clothes for Natt... and Lance... well he's fodder, so when you only have one head left he'll have no more use, so let him die, as he'll probably be 1 hit koed each turn, but kill the healer, then the dark dragon, as those are the weaker two
the mammoth is a hard boss, JUST POSION THE SHIT OUT OF IT, IT TAKES A BIT, BUT IF YOU GET IT TO 9 POISON, YOU CAN MORE EASILY WIN
*take out the healers before you poison*
you should be able to win with a good deck build, 90% of the time, but even with a good build, its like 10%, something isn't right, this is harder than the necronomicon impossible badge
Gotta say after beating the first two this wasn't 'EASIER' just more approachable, you've outdone yourself with the units, but it would be nice to have an area to show all the units you've used, or maybe all units in game so you can compare them.