League Of Legends Do 144.44 Dmg

I was wondering if some items stack and if it's worth getting multiples of them. I've seen before players get 3-4 Phantom dancers, or multiple Rabadon's Deathcaps.
I myself have usually been getting for when I play magic ability champs, Sorcerer's Boots, Rabadon's Deathcap, Void Staff, Will of the Ancients, Lich Bane & Frozen Heart. Is this a bad combination?
Would it make any difference if I got 2 Rabadon's Deathcaps? Does the 30% bonus stack? Or 2 Void staves for the Magic pen, does the %40 bonus stack? It just feels that I get capped on dmg fast but still take a strong beating even with the Frozen Heart, while others can what seem like 1-shot me. How can I get such spike dmg like that? (I have magic pen and ap runes as well & have mastery set for it too).
I've contemplated the Zhonya's Hourglass but it gives less armor, no cd reduction and no mana just for more AP and the active on it, but for 2 secs & a 90 sec cd, I can see it 'maybe' helping but is it worth it?
I understand each champ can be different, but I figure there is a pretty general route to take on this, can anyone help with ideas? Where am I going wrong?
Thank you.

DmgLeague of legends do 144.44 dmg go

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