Are there any Snowballing Supports?

Any offensive support will snowball like crazy, Annie isn't even considered very good as a support right now. Instead look at Brand, Vel'koz, Leona, Blitzcrank, maybe Zyra and Malzahar although they just got nerfed.

Zyra, she can one shot a whole team.

of course there are, silly

I don't see blitz as a true carry support in bronze because you rely too much on your team to follow up your plays. I would go with a caster if you want to carry such as Zyra or Brand.

Even after the nerf, I think Zyra is easier to play with Brand and better before level 3.

Brand can be difficult because his spells cost a ton and you really have to combo them well to be effective. IMO Brand is still one of the best hard carry supports because his combo+ultimate does so much damage in team fights.

In my opinion Leona is one because she will get impossibly tanky early on and be so hard to deal with

I started supporting with brand. He is a really rewarding champ if you get the combo but requires alot of peeing because he is like annie and needs to get close to maximize his damage. His level 3 powerspike is incomparable which you should make use off at bot lane.

Just give him long enough...

He is strong enough to provide heavy damage, turns into a huge engage frontline, can easily dive behind enemies etc. etc. Plus he is pretty safe with his Q to walls. Honestly how I climbed most of season 5.

Just throwing it out there just because you lock in zyra, or brand (carry supports) doesn't mean they're the ticket out of bronze if that's your goal. Your ticket is what you're good at, not who you can 1v5 then throw the game at baron as.

Frankly, the best supports are the ones which don't make your ADC irrelevant. Especially in bronze elo ADCs tend to fall off, get caught, or don't actually know how the role ADC works, if you take all the kills they just become heavier (unlike in gold+ which supports taking the kills is fine as the ADC will likely still come back).

Particularly: are really solid carry your carries champions as they can forgive mistakes by your ADC (mispositioning, walking into stuns, healing), glue team comps together (can engage / tank, reliable CC for a whole team, Provides good peel and a knockup for those bronze yasuos who complain), and are generally fun an enjoyable to play so thats a plus.

Playing brand or zyra won't make you climb if your ADC is constantly dying still, and your team comp isn't fitting for them such as too much ap or no real engage. Like I said, protecting and peeling your ADC is way more important in bronze than it is in gold+ cause they become much more dead weight the lower elo you get when behind. Also "carry" supports are situational sometimes, they suck vs. certain matchups (example, you pick zyra and then MF support wins lane) and lack syngery with certain ADCs (example, brand isn't good with a kalista).

Bard has the best level 1 not lane

if you take ignite you can easily force a kill early

Karma

an aggressive veigar support can hard carry, if ur lookin for off picks

A lot of these are really aggressive supports that go in the support role but I would be hard-pressed to call their champion role support. So I thought I'd suggest; She's pretty snowbally, and she's also pretty flexible with builds if you find that by some miracle the adc is good.