Mulligans
Stone Sentinel is a Saronite Chain Gang stapled to a 3 mana 4/4 on one card. I’m not sure how we ever thought it would be “bad”. Don’t forget you can trigger Murmuring Elemental with Thrall for double double evolve, or double Waterspeaker against aggro for a Healing Rain + body. Harbinger turn 6 into Turn 7 Murmuring + Stone Sentinel is pretty good most of the time. Oh, and be aware that if they’re being really slow you can often burn them out with double Kalimos or Blazecaller triggers.