New for Season 3!
An upgrade for Aegis, awwwww yeah. Aegis really falls off late game and Bulwark helps it stay relevant late game by giving you a lot more health and the whole team an extra +15 MR. It builds from a mantle so if you aren't facing much AP damage you can save the upgrade for later
Finally a support item that builds of Kage's. Not only that but it continues giving you gold after it's upgraded. If you got an early lead and bought Kage's to snowball it's worth the upgrade. Also a great item if you are with a mana hungry ADC such as Corki who can benefit from a mana manipulator early.
Oh ma gawd. Gives you health and saves you tons of money on wards. Get it.
Increases the number of wards you can have out at a time and replaces that much-needed health crystal you used to get from Heart of Gold.
Really fun item, doesn't cost that much and has and active that slows two champions. Good upgrade if you got the Kage's but don't think your team will benefit much from the aura on Shard of True Ice.
Interesting item, gives you armor and AP which are both good. Gives you promote so it's a great buy if you are having trouble pushing down those final towers. Also increases champion pet damage (unfortunately Zyra'a plants count as traps so don't benefit) so this item is an awesome buy if you have a Mordekaiser, Malzahar, Heimerdinger or something on the team.
If you need sustain in lane. I don't usually get one but it's an option instead of a faerie charm to start.
Boring old Season 2 items.
This item is amazing on any support. It gives you a great mid game team aura and makes you tanky. If no one else has one it's a must.
Another great support item that every team needs. Use the active to chase or disengage
Starks/Zekes is a good aura item to get if your AD carry is doing really well, which he should be, because he has an OP Zyra support.
In Season 3 Randuin's isn't a must-have item on a team anymore because it now only slows AAs if you get attacked. If you need some armor badly though, and no one else has it, go for it. The active is nice and it'll make you supa tanky
Really good on Zyra as it will add some punch to your ult and plants, plus it has magic resist. Got a pretty big nerf recently so now you pretty much have to be right in the middle of the fight to make use of the aura.
Has a good aura and gives lots of armor, but has cdr you don't need and mana you don't need. Randuin's is a better choice on Zyra.
Not a bad item on anyone but you would normally only get this as a last item.
I don't really like this item personally but give it a try and see what you think
Pretty much my go-to last item if you can get there. Do a bunch of damage and laugh.
Some AP for you and a really good aura for your casters, if you have an AP carry that is owning, or are running double AP, its a really great choice.
ISN'T IN THE GAME ANYMORE *cry*
If no one else gets this you have to get it. I do prefer to get it on a really tanky top laner or the jungle though, because Zyra tends to be one of the first dead in team fights or skirmishes. She can use seeds to avoid facechecking bushes though, so she is pretty good at clearing wards.
In Season 3 Oracle's now only lasts 5 minutes. It is still totally worth it, especially when gearing up for Baron.