Kozilek granting his +2/+2 bonus despite Spawn-Gang Commander losing devoid to Utter Insignificance
Today in a limited event I played Utter Insignificance on opponent's Spawn-Gang Commander, stripping him of all abilities including Devoid. But my opponent later played Kozilek, the Broken Reality, and his Spawn-Gang got the +2/+2 bonus despite not being colorless anymore.
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Rezzahan#77802 commented
Not a bug. Devoid is a color changing effect, which applies in layer 5. Ability adding and losing is applied in layer 6. So devoid makes the object colorless before it loses its abilities. And the game does not go back and retroactively change something already done in the layer system. It stupidly moves forward through the layers and does whatever has to be done in those layer. The only exception is dependency, but that can only occur within a layer, not across layers.
Ther layer system and dependency is explained in detail in rule 613. and its subrules.