Official Rulings
If I have a 2-power creature with a Soulkeeper (AoA 83) attached, my opponent has a 6-power creature and a 5-power creature, and I play Opal Knight (AoA 260), do both of my opponent’s creatures die, or just the 6-power one?
Just the 6-power one. Since Soulkeeper’s effect resolves before the destroyed creatures leave play, it will try to tag the 6-power creature for destruction even though it has already been tagged.
Source: Rulebook
If I have a 2-power creature with a Soulkeeper (AoA 83) attached, my opponent has a 6-power creature and a 5-power creature, and I play Opal Knight (AoA 260), do both of my opponent’s creatures die, or just the 6-power one?
Just the 6-power one. Since Soulkeeper’s effect resolves before the destroyed creatures leave play, it will try to tag the 6-power creature for destruction even though it has already been tagged.
Source: Rulebook
Commentary
If an ability states an effect is applied to "each creature", the effect is resolved for both Friendly and Enemy creatures.
Source: Rulebook
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