The item feels much much better now with the recent changes to it, it's just one problem with the item. Once the laning is over, the stacks just doesn't matter. +15 damage is pretty much nothing mid-lategame. You don't really notice if the stacks are up or not.
Talisman of Ascension scales into late game because it is % movespeed and that is never bad.
Face of the mountain heals for % hp, and shield is based on scaling stats.
Could Frost Queen's Claim get a small AP ratio, both on active and on passive?
I am talking like 0.1 AP - 0.2AP ratio on each stack, and like 0.3-0.5AP ratio on the active slow effect. This would make the item feel good during mid-lategame too, and it would enhance the poke of champs that does poke.
I usually sell the item when I get to 4-5 items, because it doesn't matter much at that point.
Tagging Xypherous the Item Master.