Sorry, i am away from my cards at the moment, ill edit this post later. The High elf tactic that is 0 cost, that reads to the effect of "target a unit or support card being played, force opponent to discard this card unless he spends his remaining resource pool" Spend on what? My friend argued that since it doesnt read "spend remaining to play this card" that if he spends the rest of his resources on other cards or actions, that he can keep his card. I didn't go for it, because if thats the case, this tactic isn't worth it. Can anyone clarify or add their opinion?

Spend on nothing, i.e. they have to use all remaining resources if they want their card to actually do something.

I would think, because of the last in, first out rule, you could spend your remaining resources any way you like. Any actions/cards played after the tactic in question would resolve before that tactic. So, if you spend all your remaining resources on actions/cards, when the tactic resolves you have zero resources, which you must spend all of to satisfy the tactic.

Yip. Just reread the card and it's sad but true. It's called Asuryan's Cleansing and the player can spend all resources in response on actions. Keep this in mind, though: only response actions are allowed before this card resolves, not other units, supports, or quests. So they still won't be able to recruit any more permanent cards after the playing of Cleansing unless they cancel Cleansing outright. So, they can bounce cards to hand, heal things, deal indirect damage, etc. because they all are allowed to happen in response. But no more card recruitment will be allowed before their resource pool is emptied. It's not a broken card, but pretty powerful all in all.

Yep, if they have any resources at all, when this card resolves in the action chain they must dump it all to keep the card/effect they just played from being canceled and being sent to their discard pile. So yes anything they can toss onto the stack would still resolve, but no more recruiting units, or bring in supports. or playing of quests.

What happens if the other player would play a sacrifice tactic on a unit he just played that got target of cleansing? The unit wouldn't be a target when cleansing is resolved in the LIFO chain or not?

Man, great question, grille, if I'm correctly understanding what you're asking. The wording was a little funky, but I believe you're asking whether Cleansing will resolve (forcing you to empty your resource pool) if you simply sac the unit that's being Cleansed, right? Well, although it's a very clever way to circumvent their card, I'm afraid it isn't quite allowed because of one little word: being. Asuryan's Cleansing says "Cancel and discard target unit or support card BEING played....." which means that Cleansing is interrupting the playing of the target before it hits the board. The term 'sacrifice' refers to a card in play, while the term 'discard' refers to a card in hand. Since the unit is cancelled and never reaches play, it cannot be sacced. Woulda been a killer answer to an annoying card, though!

and since you can only target units in play by default, you can't respond to Asuryan's Cleansing with Iron Discipline unfortunately, since ID targets a unit [in play]. in case anyone was wondering...

BUT YOU CAN WITH HE DISDAIN! hahaha sorry destruction.