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On the other hand...

• It isn't Psychic Immune, so Sleep is an option... but it's definitely worthwhile for your opponent to wake it up (or otherwise remove the Sleep condition), so unless you put Sleep on a Wand/Spore, this will only be a short-term delay tactic.

Actually, sleep could only target a "non-mage living creature", so it couldn't target the water elemental.

About the Paladin-
A standard Paladin probably have his sword for 4 dice, that become 6 since the elemental in non-living, plus 2 from bear streanth, plus one from dawnbreaker ring, plus one from hand of bim shalla, and plus one from Malakai's basilica for a total of 11 dice. Assuming a reroll of any non-critical dice would make an avarage damage of 5/6 times the number of dice, which means 9+1/6 average damage with each attack. Making one attack and one counterstrike against the elemental would take it to 18+1/3 average damage, which is statisticly enough to kill the water elemental (on an average roll, so no need for special luck). If he got akiro's favor, that could mitigate the risk of low rolls a little bit.  Adding eye for an eye to this deal, it would actually need really poor rolls for the elemental not to be destroyed.

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If one is faster and you have the resources to do it, then it's better. The other being 'good' doesn't matter - it's not best.

The faster one has a better chance to catch opponent unprepared, and the slower one has a better chance to handle an opponent prepared for the rush.
Since one strategy will do better against some opponent and the other against other opponent, neither could be named "best" out of these two.

Spending time on economy (certainly more than one action) would rule it out of being a rush book in my view. It's slowed down needlessly. Barring a 2pt ring, no economy can show a profit over the timescale a rush book is looking to win.

Usually I use the term "rush strategy" to describe any strategy that would destroy a training dummy with 40 life and no armor standing on the opponent starting zone by turn 6 with average rolls. Perhaps you use that term to describe a narrower set of strategies.
I have one rush book that use mana crystal+battleforge for round 1, and both times I played it the enemy mage was dead by turn 6. In both games the mana crystal was useless eventually, but just because a book bring a little economy doesn't prevent it from being a rush, and preparing for mid game in case the rush fails isn't necessarily "non-optimal".

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We have a Siren that used it's Siren call against Crevere while it was in her zone. Naiya is in an adjacent zone. Now Crevere activates. Since in the beginning of it's activation he cannot move closer to the siren, he don't have to do so. Let say he moved to Naiya's zone. He isn't hindered by anything (in this situation there were no shallow sea in either zone), so now he can move closer to the Siren.
Must Crevere now return to the Siren's zone because now he can, or could Crevere now attack Naiya since he couldn't move toward the siren at the start of the turn so he no longer required to do so?

[the same question could be asked about a flying creature as well, since they are not hindered in this case as well, but the answer should be the same.]

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You are correct. A rooted creature CANNOT move unless you pay the uproot cost. Is a creature MUST do something he CANNOT do, then he is not forced to do so.
However, if you do choose to pay the uproot cost the the creature must move toward the creature with the hate token (and can't decide to move in another direction).

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I would suggest more coral barriers the siren is all about pushing and pulling creatures around at least 2 if not 3.

Will do. It sounds like a good Idea. Thanks 

Also more conjurations to use in the terrain zones like her sea urchin can't remember the name make a deadly combo plus if someone wants to replace your terrain there going to have pay lot for it. Maybe forcehammer instead of fireball for conjurations?

A force hammer roll 2 more dice which at the best case mean 2 more damage on average (but is actually less than 2 against any armor), while a fireball give on average 11/12 burns that each deal on average 3 damage over time for a total of 2.75 damage over time, so the fireball deals a little bit more damage even though is cost one mana less. Moreover, the case in which destroying a conjuration is most urgent is the druid tree, and all trees have flame+2 making the fireball a better choice against them. Most Warlord conjurations are flame +2 as well. The only conjuration worth destroying which is flame immune is Battleforge, and they are hydro+3 so my other attack spells could make the difference.
Anyway, my copies of "Force Hammer" are either in Forcemaster books (because it is in school) or in nature book (because they pay triple for fire), and I thing they need it more.

Surging wave is water atttack spell as well instead of 6 geysers.

In my local meta flying creatures are common (and now with crusader griffins they might become even more common), especially flying familiars that have defense (such as Fellela and Huginn). Swell can't target flying creatures, just like Surging Wave, so I need some unavoidable attacks that help against fliers.

I would have some dispels and seeking dispels and a normal teleport as lesser is only friendly creatures with no conjurations attached.

I have only one extra teleport for both the paladin and the siren, and I think the Paladin needs it more. In an Ideal book I would definitely have a teleport, but trying to keep a lot of books makes you compromise a little bit (otherwise I would have taken at least 3 acid balls).
I think I do have an extra seeking dispel, so it will be added. Thanks for the help

As far as creatures depends on what tactics u want use. Pirates, sharks, push pull people and so forth. I've only seen her played twice but this would be some of my advise.

So it is either a shark book, in which case I will keep the Tanglevine, or a Tidecaller/Harpooner book, in which case I have no need for a Tanglevine and it will be replaced for another coral barrier, and I will probably include a Bed of Urchins or two.
Thanks for the help again

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While the post service in my country is really really slow, it is almost two weeks after my PvS copy arrived to my country (according to USPS tracker), so there is a fair chance I will get it next week. I already decided what my first Paladin book is going to look like (pretty similar to a melee priest), but I don't know yet how to start with the Siren.
Since I have other spellbooks, I have some limitations on some popular spells. I could take one or two acid balls and one or two rusts (but not more), and probably not more than one teleport or bear strength (possibly none, as even with my core spell tomes there is still some limit even on core spells). There is absolutely no chance of getting earth attack spells. Fortunately, I think I can get it a second elemental wand (and Naiya could cast them on the mage).

I am going to invest about 22 points on attack spells. I am thinking about-
1 Tsunami (I have to try it)
1 Fireball (as anti conjurations)
1 Lightning bolt (as anti ethereal)
4 Swell
6 Geyser (as anti Huginn/Fellella, ad generally fliers)
1 Acid ball

Conjurations will get very little space. About-
4 Shallow Sea
2 Mana crystals/flowers
1 Whirlpool (because I have to try it)
1 Tanglevine (That is what I found)
1 Coral Barrier
(About 15 points)

Equipment is going to be interesting. I am taking something like-
2 Elemental Wands
2 Leviathan Scales
1 Ring of Tides
1 Ring of Ocean's Depths
1 Voice of The Sea
1 meditation amulet
1 leather piece (I'll see what I have available)
1 Echo of The Depths
2 Shoalsdeep Trident
(I counted 20 spellbook points).
Other than the leather piece and meditation amulet, Naiya could be my battleforge. But then you will ask what would I do with 4 hand slot Items, I would probably want to stay in the corner and meditate for like 4-8 rounds (until either the enemy came to me and dissolved the echo of the depths or I think I have enough creatures) and then go offensive with the trident and possibly the wand (so it is a 2 phase strategy).

Incantations-
1 Minor Heal
1 Heal
3 Dissolve (I will have to find which book could give up one of theirs).
1 Crumble (to bypass nullify).
2 Lesser Teleport
So 12 points here.

That leaves me 51 points for enchantments (most of which will be songs) and creatures.
My non-song enchantments will include 1 rust, 1 regrowth and 1 hawkeye.
I have a general Idea of which songs I would like to try (some of each, more of those that buff my creature since enemy might be psychic immune).
Other than Naiya and Water Elemental, which creatures should I try first?

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Just compare the trident with the [mwcard=MW1Q14]Lash of Hellfire[/mwcard] which does not have the fire subtype, but the attack itself is a fire attack.

While you are absolutely correct in your analysis and did a great job in explaining it, I just have to point out that the attack of the Lash of Hellfire is a "Flame" attack and not a "Fire" attack, as the name of that damage type is "Flame".
I totally agree with the other things you said here, the type of the attack (if any) is determined by the icons in the attack bar.

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This is one of nicest post I've seen in the internet