Originally Posted by axesandspears
Any item with stackable Cooldown Reduction is overpowered.
Would you say Frozen Heart stacking CDR would be overpowered? I would hope not, because you're spending the vast majority of your gold on the attack speed debuff.
Would you say Nashor's Tooth stacking CDR would be overpowered? I would hope not, because that's a tertiary item you get specifically for CDR, sacrificing the stats you need for your archetype.
I don't see why Black Cleaver having stacking CDR is remotely "overpowered." I don't even see the stacking ARMOR PEN being remotely "overpowered." Build a Randuin's Omen and a Thornmail or Frozen Heart, then get a nice big chunk of health from Warmog's or Rylai's or something. If you're a squishy, get better positioning (Zephyr is awesome for this.)