First of all, please do not use CDR marks and seals, they are hardly worth it. You will get more out of Magic Pen marks (he is not a dps, but it will help you have a good early game) and for seals I prefer mana per 5 / level, this will help you ALL game. Please read Searz's guide on runes, and you will see these will be much more beneficial.

For your items, why would you get boots so late? If you get boots after Archangels, Zhonya's, AND glacial shroud, you are probably going to die a lot simply because you're too slow to outrun people, even with your timewarp.

For boots I would high suggest merc treads over boots of swiftness, cc and nukers are your bane.

Get an Abyssal Scepter over Void Staff, your point is to buff others, not yourself. This will give you adequate ap and MR as well.