Can your Legend unit be a different language than your main deck?

Ruling: Yes, your Legend unit can be a different language than your main deck. Each deck zone (main deck, runes, battlefields, legend) must be internally consistent in language, but can differ from each other.

Sequence:

• Main deck (including chosen champions) must all be one language
• Runes must all be one language (can differ from main deck)
• Battlefields must all be one language (can differ from main deck)
• Legend must be one language (can differ from main deck)

Nuances:

• Chosen champions are considered main deck cards and must match the main deck language
• Legend units exist outside the main deck and follow separate language rules