His current passive is just get souls for armor, ap, and now small buffs to his W and E.
What if we changed it so that only champions, large monsters, cannon/super minions, and epic monsters drop souls but arent all "equal souls".
What I mean by this is that Thresh gets different bonuses from different soul sources. He would still be infinitely scaling just a little different.
Cannon minion and large monster souls increase his E passive auto damage. Also armor.
Champion souls make his lantern shield a lot stronger for each soul.
Dragons souls give a flat amount to his E shield and armor but elder gives triple the benefit.
Rift Herald makes his E a ton stronger.
Baron gives 5x the benefit on all of his bonuses.