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The special ability “place” can be negated during the same game phase in which it is activated; it cannot be negated after that game phase is completed. However, the special ability on the placed card can be negated unless specified otherwise.
1. Cov-o-Noah does stop Abom if used in the same phase.
...If used after the same phase, it negates it for the phase (might be turn here, I'm not 100% sure)......Scapegoat would negate Abom and discard it. The ability would halt instantly and any cards discarded that phase would return.
I think you explained it well. Even though you negate the enhancement, you are unable to negate the placing of the enhancement. So next turn it would still work.
On that, I'm pretty sure it's by phase. That's when all abilities "refresh."
Negating an artifact during battle does not go back and replay the whole turn as if the artifact was not there; it only negates the special ability of the artifact from the current phase forward.
Ok thanks guys, I was pretty sure you could one turn stop Abom, there seemed to be a lot of confusion about that card. I have seen multiple times that placed cards abilities cannot be negated and I though that was odd. All we need is some one "official" coming by and agreeing and we have it all wrapped here.
You can only negate the placing of placed cards in the phase they are placed.You can negate the other ability on the placed card for the current phase only. If you discard the placed card without negating it, then its lasts until the end of the phase, and then ends when that phase ends.If you negate and discard a placed card (such as with Plague of Hail, iirc), then the ability is undone for that phase and forward.The REG quote about negating an artifact "from that phase forward" is talking about a negate+discard.Negates and/or discards of artifacts work exactly the same as negates and/or discards of placed cards.