Yep. Pick the black knight and it can kill me. 
Paladin trait in Dragoon, double attack, double stats, +1+1 when win. Dont need the barrier actually. its there just to make sure i'll win. Dragoon Hp already 200-300. 6 enemies mean 6 damage per round. so I can go 30-40 round without barrier. With barrier i can go 150-300 round dealing double damage.
I thought so. It's one of the builds I want to do, but also with the Crow trait, in case a Palisade appears, or a Maze.
I just got to 125 with two Incarnators with a copy of themselves each, and next to it an Obelisk, Barrier, Gladiator, a Hound, and the Crow, both copying the Gladiator's damage, and and being able to survive up to five times, but the enemy already do too much damage and the Crow was not enough.
My problem is that I can't find any way to improve the damage with the cards except with the combination Obelisk, Barrier, and Gladiator, but a maze comes and game over.