Seems like good pickup on tanky dps Jayce with it's buff. 20% CDR along with AD, HP, LF and aura for whole team. Paired with BC it gives him almost full cap or just get Frozen Heart for more tankiness (and mana) and hit the cap.
Or is the AD/LF too low for him? What about using it on jungle Jayce (instead of Locket in the Locket>Aegis combo)?