Abzan Whip is my one true terrible matchup (GR Midrange). Even if I start to get going (which is inevitably stalled by murderous cuts/hero's downfall/whatever), by the time I'm in range for the killing blow, a whip or Soul of Theros comes down, and they gain a bunch of life and I cannot win. Boo to that deck.
A nightmare scenario occurred, I played a rabblemaster turn 3, they played a whip on their turn, I did something on my turn 4, then they played an Arbour Colossus and he purposely left my Rabblemaster alive. The token was forced to attack and he gained 6 for the next few turns. RIP me.