Are mixed language decks tournament legal in Riftbound, specifically when mixing languages between main deck, rune deck, and Legend cards?

Ruling: The language restriction is currently a guideline rather than an enforced tournament rule. Mixed language combinations (such as CN main deck with English runes, or English deck with CN Legend) are technically allowed for now.

Nuances:

• The original stated rule about "all cards MUST be of one language (due to card stock)" is not actually part of the Tournament Rules Document (TRD)
• Official clarification on this rule is expected later
• The issue has limited practical impact in western regions where only English cards are currently available