A Helpful Tip for Ivern Players

Don't build him heavy AP, and don't try to go in on your own. Your job is to land snares so that Daisy and your teammates can jump in and do the damage. Daisy is very strong on her won, having 3500HP and 175AD at max level, but only has a 50% AP scaling on bonus health and 25% on AD. If you build a squishy AP path, you probably won't help out as much (unless you're going AP mid, which is risky but hilarious).
Get a rod of ages early, because you need both health and mana as flat stats. His passive doesn't use %values, so as long as you build up both of those stats, you won't have to worry about your passive costs. It also gives him a good bit of AP in the late game to help out with his shield to protect Daisy and friends.
Since you have a snare and a shield with a slow, you usually have enough opportunities to escape enemies if you can survive long enough. That's why he's best suited standing between your front line engage and your back line squishies. If Ivern is tanky enough, he can use Daisy as a front-line melee to disrupt, while he focuses on peeling and blocking for his ADC and mages.
If you go Rod of Ages with no other AP sources, and instead build full tank, then Daisy will have: > 3550 Health > 200 Attack Damage > 125 Armor and Magic Resist
Otherwise, if you manage to build 500AP and try to engage, Daisy will have: > 3750 Health > 300 Attack Damage > 145 Armor and Magic Resist > And will die as fast as you do
I am by no means a master of Ivern, and being in gold 4 places me pretty far below the elite players in LoL, but I've seen a lot of Ivern players building the wrong items because they don't understand his place in the game. Some of them just follow the recommended because they haven't thought about it. The fact that most players are running burst/assassin meta right now only makes it more helpful if you don't, and instead play a Tank Ivern. [slayer-jinx-catface]
P.S. I'll attach a graph I made of his passive resource usage, in case you didn't know: http://imgur.com/MM4Ch9F
Then generally defense items of some kind.
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or some other MR item.