its capped at 40%

Interesting thought on rylais vs frozen heart; however i find that because it reduces enemy atk speeds by 20% it is better off than just having more health or slow with spells (that u already have) since ppl like xin will still kill u. Good query tho :)

CDReduction caps at 40%, but 3% over isn't that bad, you could drop some CDR somewhere to optimize once you have all the items; but you're just as well keeping it to have the extra CD before you finish item'ing out.

I personally prefer a health item like Rylai's over Frozen Heart on my casters. The extra armor from Frozen Heart comes out to ~21% more armor reduction (assuming 70 base armor), and Rylai's boosts your hp by about 25% (assuming 2k base hp). The advantage of Rylai's is that it boosts your survivability against both physical AND magic damage. Also, Rylai's gives you more AP (hurray!). I suppose the extra CDR and the area debuff could be nice too, but I'd rather just grab the golem buff for the CDR; and with Archangel's you shouldn't need the extra mana from Frozen Heart.

Didn't vote

+1 For the name xD