Dragon Spiteful Priest Theorycraft

Obviously Keleseth is the number one priority. Cleric is also generally good, even more so since it's the only 1-drop in the deck. Against aggressive decks you should be looking for your 3-cost taunts and Duskbreaker to help deal with wide boards in the early game. Gluttonous Ooze could also be a keep if you're facing a deck that utilizes weapons for aggro or combo purposes. Curious Glimmerroot is the best 3-drop in control matchups.