Hopeful Loser
Balanced Cost = 2 (1.9 Average Attack) +0 (0<HP<6) +1 (irregular synergy with Adrenaline) = 3
King of Dreamers
Balanced Cost = 2 (2.35 Average Attack) +0 (0<HP<6) +1 (irregular synergy with Adrenaline) -1 (upgrade) = 2
3|2 cost would be fine. These calculations assume that the skill is passive and is effected by antimatter.