Difficulty is 160% if you play 10 games (with rests on days 111 and 113); in 4 games, I definitely summoned devils... Octavia is a must-have starting hero, and if you also get a weak money-maker, then you're set for success :)
But really, the question isn't about the difficulty, but about the template! There's still a small difference between playing Jebus and, for example, Panic.