>Can you remove a last counter on a spike soldier for it to get +2/+2
>until end of turn, or does it die immediatly following the removal ?

It dies immediately, right after you pay the cost of its ability by
paying the 2 and removing the counter. It becomes 0/0, and thus
automatically has lethal damage, so dies before interrupts to its
ability can even be announced.

>When does exactly a spike die when no more counters are on it ?

Immediately. It doesn't "live until end of turn" or "live until end of
phase" or anything; it dies because it has lethal damage [0 damage >= 0
toughness].
 

 Boy did I just dig up a goodie!!!!!!  READ THIS!!!

>I guess I just need some clarification on this one, but here goes:
>
>Pandemonium is in play, I play a dreadnought....I cannot sac the
>creatures to keep it in play....does the Dreadnought deal it's power in
>damage because of Pandemonium.

You play the Dreadnought's comes-into-play triggered ability, because
you put it into play. You also play the Pandemonium triggered ability,
because the enchantment says you do. So since you play both of these, and
they happen in the same series [since they trigger off the same thing],
you get to choose the order ... so you may do the Pandemonium damage
before dealing with the PD's feed-me-or-bury-me.
 

 I have really got some good stuff here!!!

If the enchantment is moved with Enchantment Alteration, the number of
counters is unchanged. [D'Angelo 05/04/98]

Coffin Queen

     The activated ability has two parts. First, it puts a creature card
into play as a one-time effect. Second, it sets up an ongoing effect that
tracks what happens
     to the Coffin Queen. If this second effect is not ended before the
Coffin Queen leaves play or untaps, then the creature is removed from the
game when that
     happens. [WotC Rules Team 12/18/97]
     If the creature brought into play phases out, the tracking effect ends
and the creature will no longer be removed if something happens to the
Coffin Queen.
     [WotC Rules Team 12/18/97] [Duelist Magazine #22, Page 27]
     If the Coffin Queen leaves play before the creature comes into play,
then you simply get to keep the creature. [Duelist Magazine #23, Page 22] If,
     however, you just lost control of the Coffin Queen and later get
control of that same Coffin Queen and lose control of it again at some time
after you got the
     creature, the creature will be removed from the game at that time
because the Coffin Queen remembers that it gave you that creature. [bethmo
10/19/97]