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Necroskitter has the ability to return creatures your opponents control under your control if they die with a -1/-1 counter on them. Sound perfectly fine to me, but I read here that when an undying creature with a +1/+1 counter on it dies through an effect which places enough -1/-1 counter on it, state base action is checked and the last information was, that it had a +1/+1 counter on it, so undying won't trigger.

Is this the same for Necroskitter? If there is a 1/1 creature and I play mtg:Black Sun's Zenith for X = 1 and place a -1/-1 counter on it, that state based action doesn't see a -1/-1 counter and Necroskitter won't trigger?

Tl;dr: If I place a -1/-1 counter on a 1/1 creature will I get it with Necroskitter? If yes, why does the game see the -1/-1 counters placed on the creature?

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If it's a regular 1/1 creature, it will die and you'll get it back with Necroskitter, since when it dies it had a -1/-1 counter on it, so it qualifies.

If it's a 1/1 creature with a +1/+1 counter and 1 normal damage already, it will get a -1/-1 counter; that -1/-1 counter 'merges' with the +1/+1 counter, which would make them both vanish at the same moment the creature leaves the battlefield.

608.2g If an effect requires information from the game (such as the number of creatures on the battlefield), the answer is determined only once, when the effect is applied. If the effect requires information from a specific object, including the source of the ability itself, the effect uses the current information of that object if it’s in the public zone it was expected to be in; if it’s no longer in that zone, or if the effect has moved it from a public zone to a hidden zone, the effect uses the object’s last known information. See rule 113.7a. If an ability states that an object does something, it’s the object as it exists—or as it most recently existed—that does it, not the ability.

The 'creature' referred to by Necroskitter is expected to be on the battlefield; creature cards in graveyards can't have -1/-1 counters on them. So last known information will be applied; it 'sees' a creature with a -1/-1 counter (and a +1/+1 counter) on it, so you'll get it back with Necroskitter.

It's essentially the same situation as Why doesn't Undying trigger if a creature with +1/+1 counters dies from -1/-1 counters?, the answer there explains the timing in great detail.

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+1/+1 counters and -1/-1 counters cancelling eachother out is a state-based action, same as a creature with 0 or less toughness dying. That means that if a creature with undying has a +1/+1 counter on it, and some effect (an ability, combat damage from something with wither or infect, etc.) places enough -1/-1 counters on that creature to kill it, it will die exactly simultaneously with the counters cancelling. Last known information therefore had it with a +1/+1 counter on it.

With Necroskitter, on the other hand, there is a delay between creatures getting -1/-1 counters and them dying from it. Most of the time you don't notice this delay, because you can't play spells or abilities in it, and nothing can begin to resolve between the two events. However, it is most definitely there: the damage or effect that places -1/-1 counters places them, and after that, state-based actions are checked and creatures die. Necroskitter will trigger from last known information.

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    I like the explanation with simultaneously canceling the different counters after they were placed and delay between damage assigned and state based action checked. This is where my confusion was. – Eggi Jul 18 at 9:30

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