Overburden was the one that I liked the most. As a bonus, I happened to own three copies which meant testing it wouldn't require a large outlay of money. And my money > less of my money.
Playing against Lauriel, though, the problem became pretty clear: This is a Humility deck and everything that isn't Humility and Orim's Prayer probably doesn't have the impact on the game that I want it to.
On the other hand, when I had Overburden out on turn 2, I got the reaction that you always want when you play a card that someone isn't familiar with: Oh, no.
And whenever that reaction comes up, that's a Good Thing. I want to play decks that do that, because I'm usually operating a little off the beaten path.
So I'll keep testing it but that card is on a short leash.