Another way to deal with AD champions for AP Champions
I've seen alot of threads in the boards asking for buffs to Zhonyas, new AP Armor item, and nerfs to hex/Maw so I experimented in a game to find a new way to better deal with AD champions and found that Frozen Heart can work better than Zhonyas. I build both anyway just to be tanky.
This item gives double the armour of Zhonyas, Mana, CDR, and it's much cheaper than Zhonyas by 700 gold. It's everything an AP champion could want except for AP.
It's funny to see Zed's who think they can ult me and quickly kill me with this build only to fail and I can tell them in all chat, "Zed don't focus the tank."
Feel free to check out my recent matches. It worked wonders for me in game. Please consider it!

, proceeded not to die ever to Yasuo during the laning phase.