1. If Stannis Baratheon attacks and my opponent doesn't have any Lord characters but has a character that is "Immune to character abilities", can defend him?
2. Can I save a character of returning to hand if he have Bodyguard attached?
3. If I have a character that is "immune to card effects". Does he die if "Valar Morgulis" is revealed? Can he be selected to die with wildfire assault?

zarius said:

No. Stannis specifically says "...that player cannot declare defenders." So Stannis' effect is working on the player, not on the character. Immunity only helps against effects that work directly on the character.

If Stannis said something like "... characters cannot be declared as defenders if their controller does not also control a Lord character," then the effect would be working directly on the character, and the character could be immune to it. Look at Wex Pyke for a real example.

zarius said:

Bodyguard says "Discard Bodyguard from play (cannot be saved) to save attached character from being killed or discarded from play." Returning a character to your hand is neither killing nor discarding them. So no, Bodyguard cannot help in that situation.

zarius said:

Plots are cards, so plot effects are card effects and someone that is "immune to card effects" is immune to plots.

Technically, you don't choose anything to die for Wildfire Assault. You choose up to 3 characters and kill the other ones. Now, when something is immune to X, it cannot be chosen as a target by X. So if you have a character that is immune to card effects, you can never choose it as the target of a card effect and could not choose it as one of the 3 cards to not be killed by Wildfire. That doesn't matter, though, because the plot effect can't kill it anyway and it'll stay on the table.

ktom said:

sorry, I got confused about the end of the explanation. if a character is immune to card effects, this character wouldn't be able to be chosen by the effect of Wildfire Assault. but if he is not one of the three chosen characters, then he would be killed, wouldn't he?

ktom said:

Pedro Lunaris said:

Immunity to X means:

1. The card cannot be chosen as the target of X.

2. When X resolves, the card ignores it, targeted or not.

So if a card is immune to card effects, you could not choose it as one of the characters to "live" for Wildfire because you would be choosing it as the target of something it is immune to - violating #1 above. That part is clear, right? You cannot choose Cat o' the Canals as one of your 3 characters to remain when your opponent reveals Wildfire.

Now, when you kill all the other characters for that Wildfire, a card effect is resolving, right? The characters that die are not the targets of the effect, but they are being killed by a card effect. So Cat ignores it - and doesn't die - as #2 above says she should.

End result: you have 4 characters on the table: the 3 you chose to not die and the 1 (Cat) who ignored the killing effect.

Make sense?