Cards I hate the worst: Rebuild & Tournament
2nd worst: Saboteur, Ill-Gotten Gains, Possession, King's Court
Then: Sea Hag, Familiar, Cultist, City
The third tier I'm fine with playing IRL because IRL we don't play very competitively, but they can be really annoying when playing people online. Some of the others I've tweaked for when I play IRL, and some I just avoid playing with. From the looks of it, I'll probably mod Champion for IRL play when I get Adventures.
It was really frustrating yesterday when I played a league match yesterday and 4 of the 6 games had at least one of my most hated cards.
Haven is also one of my favorite $2 costs, but I can't wait to get adventures and play with Gear and the rest of them. And I really enjoy those games when I get decent use from cards like Chancellor, Harvest, or even Scout.