1.


We have several options here:
a) Stop him from increasing his attack: Lady Yilith, Shulong for those who can afford it, or a more cheaper option is Escaping Death in a quick marauder deck (I would suggest Eclipse or Zil shadow guem). Monozilk can prevent this attack increase for 1 fight too

b) Significantly decrease the damage he deals
For this, Master-mage Marzhin is the best choice Fill your deck with as much water spells as possible, add some cards that can activate marzhin's order bonus (Genius, It is time, etc.) and go for quick discarding.
Water spells increase marzin's defense, so he should be fine, and meanwhile you can deal damage with the two allied characters.
If you cannot afford the expensive water spells to help your cause, then try to add some fire spells to your deck

c) Quick death
Elfines are nasty little things But here you love them.
Belladonne is the core of the deck, you can team her up with any Sap Elfine. Storm bow, Hit for hit, solstitial fruit are all needed, War hawk and Opportune moment are useful as well.

d) Insane healing
Who would be better here, than our beloved Aelide, Queen of Avalonia. Team her up with Ysild and Great duke, protector of Dhun, add some King's crown, Cup of life, and literally any other card that increase her spirit (Slasher is good choice, yes )

I did not try any priest deck here, but i suppose that they would be too slow to survive such a devastating attack.

2.


This guy is a crazy healer.. for this, I will only suggest some cards that can prevent him from healing himself, or use his healing against him

- Sentence if you can afford it
- Sol'Ra Avatar
- Cobra venom is quite effective in a Marauder deck
- Kitsana.. yes, she is very good here. I would suggest to team her up with Marauder/Mage tsoutais like Li Lan or Ziya
- my favourite here is Precognition. I use it with Akhet, Lodir and Shrikan. Desert's children is a good card to boost attack. If you have Bes, exchange Lodir with him.
- you could try to play cards that deal their damage after Sethmet already healed.
Falling branches or Shadowmancy are perfect.

3.


Since this girl can quickly finish off your characters, your best option is to kill her as quickly as possible. The cards she plays are not very powerful, so no need to worry. She deals direct damage, so this means that at least one of your characters will be gone at the end of each fight if your level is high enough .. this sounds very bad indeed.

I prefer playing the following decks here, because they are quick:
- Elfine (mentioned above)
- Eclipse (Inatka can be useful for damage reduction). Eclipse marauders have a pretty high health, and if you play Burning soul, you have very good chances of winning, especially if you play it after Time to die or gone with the death
- Shadowmancy decks with Dagger-master Arckam and 2 other shadow guem marauders with high attack.
A nice and interesting team up can be Djamena, Djoser and prince metchaf for those who can afford it
I must admit that i did not ever try Witchblades in this situation, but they can be good too, for their multiple damage.

Remember, speed is the key here