Mulligan for Rafaam's Scheme, Darkest Hour and Bloodbloom. Also use Plot Twist and hero power to dig for the combo. Plot Twist also helps shuffle minions back into the deck.

Try to hit a Imp card > Bloodbloom > Darkest Hour around turn 6.

Don't worry too much about minions. Just keep them at bay, and clear any taunt's.

Against Res Priest just play the slow game and don't kill any of their minions. Go for the OTK on round 6, 7, or 8.

The ideal hand is Rafaam's Scheme, Darkest Hour and Bloodbloom. Then on turn 5 you play Rafaam's Scheme, then Bloodbloom, and then Darkest Hour. Ideally that will generate 5 minions that turn into 2x Charged Devilsaur, Leeroy Jenkins, and 2x Reckless Rocketeer/Doomguard. That's 26 damage on round 5.