Can different sleeve colors be used for main deck, rune deck, battlefields, and token units in Riftbound tournaments?

Ruling: Yes, you can use different sleeve colors for main deck, rune deck, battlefields, and token units/buffs. The requirement for sleeves to be the same color only applies within a given deck (main deck or rune deck), not across different card sets.

Nuances:

• Battlefields should all be in one color of sleeve to avoid giving away information, but that color does not have to match the main deck or rune deck
• Tokens aren't cards and sleeve rules basically don't apply to them since they never exist in private/secret zones where their identity needs to be concealed
• You can use the same color or different colors for tokens, or even clear sleeves (though clear sleeves cannot be used for cards)
• Some players use only 2 colors to save money (e.g., main deck and battlefields in one color, runes and legend in another)
• The legend can be in a separate magnetic case or slab and doesn't have to match the main deck sleeves