Opal Knight
From Archon Arcana
Opal Knight • Sanctum • Creature • Rare • Play: Destroy each creature with even power. • Artist: Matthew Mizak • Card Number: AoA (260), MM (172)
FFG Rulings
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Just the 6-power one. Since Soulkeeper’s effect triggers before the destroyed creatures actually leave play, it will target the 6-power creature for destruction even though that creature is already tagged for destruction.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 triggers before the destroyed creatures actually leave play, it will target the 6-power creature for destruction even though that creature is already tagged for destruction.
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