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I was not trolling.

I am saying a Siren has plenty of weapons at her disposal.

A Siren fighting a druid is like a warlock fighting a Necromancer.

Druid by design and creatures are just water resistant and Necromancers are poison resistant that is all.

The picture painted in the quoted post was to me from a water aspect.  Which is why I commented if she was a water only Siren.

Well, it is true that most druids don't take Togorath, but if aggressive sirens will become too common they might start including him. Or if they want some cheaper counter to aggresive sirens they could go for a couple of Leviathan scale armor, since it is also in school for them. The eagleclaw boots most druids take anyway are also a pretty good counter since being unmovable make you ignore pushed and turn slams into dazes.

But let say that one druid only have barkskin (which is a cantrip) and his tree for his defence, and that the siren has her ring and hawkeye for her offence. If the siren attack one round with 2 attacks of 4 dice (when she don't have initiative) and one round with 2 attacks of 5 dice, then against a mage with armor 2 that heals 4 every upkeep phase it will take the siren way too much time to kill the druid.

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There are even estimated arrival dates in that store site. July for the forcemaster and october for the warlord.
It is possible that there would be an arena expansion before. If so, then  we would probably see something about it soon.
Other expansions mentioned by Arcane Wonder officials in various interviews include the archmage, the wizard and forcemaster (I think they named it "balance the force" or something like that) and the Barbarian VS Sorcerer (and an illusionist was once mentioned as a mage). Since arcane wonder usually alternates between a couple of new mages and a couple of new versions for old mages, the next mages would likely be the new wizard and forcemaster. It is possible that it would be the next expansion. I would even say it is likely, since the archmage expansion is a new game mode like domination, and isn't likely to include radical changes such as frost (and there were hints that frost should be out in the next expansion).
At least that it my guess, I am no playtester and I can only guess by the small hints that are published ^_^

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1) Correct push effects are always directly away from the caster
2) The game checks for "directly away" during each individual attack's "damage and effects" step.  Therefore, wherever the caster is at the time that it checks is the origin zone for referencing both Line of Sight AND "directly away".  Using your example, all creatures that were attacked before your caster reference the push from the original zone but all creatures attacked after your caster is pushed reference the new zone.
3) The source of Tsunami is the caster.  Wherever the caster is and whether the caster has Line of Sight determines whether a Tsunami attack can occur and where the push effect can go.
4) If the caster dies during Tsunami you finish the current zone and then the caster no longer has line of sight to any other zone (due to being dead) and Tsunami makes no further attacks.

Thanks for the answers
Why doesn't being pushed by your own tsunami end the spell immediately just like teleporting with divine intervention end spells immediately?
And if the tsunami caster dies and you keep targeting creatures in the same zone, were would they be pushed?

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I hope the winner will be either a holy mage or a bloodwave warlord. I would also be glad to see  a wizard and a johktari beastmaster in the final four.
I guess the winner is most likely to be a necromancer, a forcemaster or a siren.

Warlords got pretty nice tricks with these steadfast boots (which can be cast on an enemy mage together with a tanglevine), and the ballista and the gloves are really good. It seems a bit more likely that a warlord will be in the final four than last years.

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But maybe Frost is in Nature School?
Baerskin a lvl 1 Armor 2 Armor Frost -2
Dragonscale Hauberk, Wind Wyvern Hide, Storm Drake Hide,...
What you think about Frost...

I first want to note chitin armor is nature while acid spells are water, so we already have an exception. 

If we examine ice themes in common fantasy worlds, then in D&D ice is themed toward water while in Exalted cold is themed toward air (and somewhat toward dark with the abyssal exalted).
The Water school already include two of the most useful attack types - hydro and acid. Both surging wave and acid ball are really common spells that most competitive books include a copy of (even when not trained in water). Nonetheless, I somehow remember someone from arcane wonders saying somewhere that frost is supposed to be a water spell (a long ago, I think in one episode of mage wars Mondays). It was a long time ago, so maybe I didn't remember it correctly.
The Air school already have lightning and wind. Unlike hydro and acid, most competitive books not trained in air don't take lightning or wind spells. Considering the next arena expansion is supposed to include a mage trained in air (wizard), it makes air a possible candidate. [Unless the barbarian VS sorcerer is before wizard VS forcemaster?]
The dark school is out of question, since now that the necromancer counts as one of the best mages there is no chance that arcane wonder will give such a major boost as in-school attack spells. Not likely.
Nature school actually sound like a fair possibility, since the beastmasters aren't the best mages right now (and the druid have enough good in school attack spells anyway). Might give some interesting possibilities for beastmasters.

I don't think there are currently other schools that could be serious candidates for frost

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With priests they fit very well, and combine very well in the general strategy of priests (daze and stun them, so they wouldn't kill you while they die from the burns).
I tried them with a paladin, and dazing your challenged enemy reduce the risk from their rerolling against your paladin.

If at first glance they seem weak, it is because it is easy to underrate the daze condition.

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Seems interesting, but quite strong. The 2 MAGE ONLY upkeep+2 enchantments currently in the game are barkskin and forcefield. Barkskin has a reveal cost of 2, is a level 2 spell and a cantrip. Forcefield has a reveal cost of 10, is a level 4 spell and isn't a cantrip. I think these spells are closer in power to a forcefield than to a barkskin, so I would raise reveal cost to 5 (which is still closer to barkskin) and remove the cantrip keyword.