What does this card's (Rule) mean, exactly?(*This card's "Also treated as Name: [Sistermon Noir] and Trait: [Virus]" has been changed to "(Rule) Also treated as Name: [Sistermon Noir] and Trait: [Virus]")
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Official Ruling
This is a special rule for this card that always treats it as if it also has the name [Sistermon Noir] and the [Virus] trait.
Source: BT6-084 Sistermon Ciel