I've tested other builds and changed my build: scaling seal for mana regen instead of armor and Tear of the Goddess instead of Chalice of Harmony. Soo no more mikael's crucible exept for bot support and undying heimerdinger, tons of damage late game instead. :)

I see, but I think Athene's Unholy Grail's ability power bonus is surperior for a midlane item than Mikael's Blessing, despite the fact that you go over the limit of your CDR.
Mikael's Blessing is usually bought by supports, and it is just a bad item if you go mid, as it gives no offensive stats at all (which is usually the most important for a mid laner).

Athene's Unholy Grail gives 20 CDR + Banner of Command 10CDR + masteries 4CDR + UPGRADE!!!'s passive 20 CDR + maybe Crest of the Ancient Golem... You go way over the maximum CDR which is 40%. I think having Chalice of harmony unupgraded for a long part of the game is fine. As for Michael's crucible, I found it more useful late game then Unholy grail.

Liandry's Torment is a good option, I think I will had it. Turret's don't apply the passive nor the Magic penetration but on the other side, they slow with the ultimate which double the damage. Good to weakens the tanks with missiles.

Get rid of Mikael's Blessing and Rod of Ages in the end build and replace it with Athene's Unholy Grail and Liandry's Torment. Then it's a decent full build, I think.

I made this build as modular, you dont need all the early items. You just need to choose 2 or 3. For CDR items, since passive gives 20% and the maximum is 40% you dont need a lot, especially if you rely on the blue rune for a big part of the game. thx for you awnser.

tear, chalice AND catalyst is just too much early stuff. Mikael's makes no sense either. Get some CDR and some AP and play heimer right.

You might want to read this and add somesthing like:

add some coding