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Jan 8, 2013 -- 11:08AM, Tristan82 wrote:

As far as I understand, yes you can, since while your Ezuri is being targeted that means Terror hasn't resolved yet, so you can use its hability and place it on the stack, this will lead to resolve first the +3/+3 (i.e.) and then Terror will be resolved.

You can't interrupt a creature's hability if the spell doesn't say so. For instance if you have Thraben Doomsayer and you tap it to place a token, and then your opponent uses a Searing Spear on him, both spell and hability go to the stack in the cast order, so at the end both will resolve.

Although we always appreciate people lending their help here in Rules Q&A, we prefer that you answer questions only if you are certain of the answer, and ideally only if you can either cite Comprehensive Rules or are a Judge/Rules Advisor. This helps cut down on confusion.

It also helps guarantee closer to exactly correct answers so that the question asker doesn't later rely on faulty reasoning to make incorrect decisions later down the line. It also helps ensure proper terminology as much as possible.

In this case, as others have said, in Magic the process for abilities and spells goes as follows:
First you go through the process of announcing the spell/ability.
Then it goes on the stack. At this point either the player who played the spell or activated the ability may chose to take another action or they may pass priority.
If they pass priority, the other player gets a chance to do something and you go back to the first step with the new spell/ability. If they don't, the ability begins resolving.

In this case, what that means is that the first thing that happens is the opponent casts Terror . Then he (or she) has to give you a chance to respond.
Since abilities can be activated at instant speed by defaults and neither ability has a restriction on timing (See Dimir Guildmage for an example of a restriction) you may choose to activate the ability in response.
Your opponent is once more able to do things. If they don't, your ability will resolve. In the case of Ezuri's second ability, this means your elves grow in size.
Then you both get another chance to do something, starting with the active player (Whoever's turn it is). You could activate Ezuri again, for instance. If neither player responds, Terror resolves and Ezuri dies. Note that Ezuri cannot save himself using the first ability since it says 'another' target elf. Plus Terror prevents regeneration.

Another important note is that for most abilities, once the ability has been used, the source doesn't have to survive. For instance, if he used Terror in response to Ezuri's ability, your creatures would still get bigger, Ezuri would simply not be around to see it.

Jan 8, 2013 -- 11:22AM, Dragon_Nut wrote:

Jan 8, 2013 -- 11:17AM, Tristan82 wrote:

Thanks, but my post is a fact, unless there are any rule that says it isn't... just omit "as far as I understand"...

Your end conclusion was correct, but your terminology was not. You don't 'interrupt' abilities, you simply respond to them. And you can respond to them with anything that you can do at instant speed, but removing the source does not usually prevent the ability from resolving. Terminology is important since Magic is a complex game where quite a few changes happen due to very minor differences in wording.

You are playing with words dude... let's keep the way it was; no further discussion.

Jan 8, 2013 -- 11:38AM, tanuki-mario wrote:

Jan 8, 2013 -- 11:28AM, Tristan82 wrote:

Jan 8, 2013 -- 11:22AM, Dragon_Nut wrote:

Jan 8, 2013 -- 11:17AM, Tristan82 wrote:

Thanks, but my post is a fact, unless there are any rule that says it isn't... just omit "as far as I understand"...

Your end conclusion was correct, but your terminology was not. You don't 'interrupt' abilities, you simply respond to them. And you can respond to them with anything that you can do at instant speed, but removing the source does not usually prevent the ability from resolving. Terminology is important since Magic is a complex game where quite a few changes happen due to very minor differences in wording.

You are playing with words dude... let's keep the way it was; no further discussion.

 
Leave the answering of Rules questions to the pros. I know that you want contribute, but if you do you need to do it in a very explicit and precise manner.

Also, there are more than enough people on this forum who are VERY credible and are quick to answer.

That's the problem of speaking several languages, you mix them up, so it seem that everyone here knows everything, good for you...