The ShiftstonedEternal Power Calculator is a deck-building tool that visualizes your odds of drawing enough Influence and Power based specifically on the cards found in your deck.
I was dead set on building the best Keelo deck. Once you have the weapon of your choice, it's just able trying to wield it the best way. I don't have to have a positive matchup against aggro if I don't think I'm going to face it that often. So, I agree the matchup is bad. It's my job to just try to minimize the chances of losses and maximize the chances of wins. First, half the time you are on the play which is pretty much a gain 4-6, so a little luck there helps. Second, you can get a little lucky and play an early Blightmoth, Two-Face or Keelo on 2 or 3 to eat a unit or eat a burn spell (causing them to play off curve). Then, you want to play one of your higher threats. Making sure you are sequencing your power to always allow yourself the out of drawing into the ability to turn 4 Rolant is important (whereas in other matchups, you might not mind playing it on 5 or later).