For deck building, do we only need to focus on Domain (runes) when considering Domain Identity restrictions, or could there be other identity restrictions later?

Ruling: For beginners, only focus on Domain (runes) matching your Legend. Cards with one Domain must match that Domain, cards with two Domains must match both, and Signature Spells must match the Legend's name.

Nuances:

• While the rules mention Domain Identity could theoretically include Type, Tag, or other attributes, currently only Domain (runes) matters for deck building
• The Domain Identity rules section may be clarified in future versions