Here are just a few that I found just looking at the SOI block-
engulf the shore (cause it wipes out your creatures as well),
behold the beyond (since you're giving up your entire hand to get only 3 cards),
creeping dread (because it's a mandatory effect and not a may effect),
morkrut necropod (big creature that requires a lot of upkeep),
goldnight castigator (dealing that extra damage can hurt),and
fevered visions (since letting your opponent draw more cards in the hopes they'll take damage can be bad depending on how you play this card).