Are sleeves required in competitive play for Riftbound?

Ruling: Sleeves are not required in competitive play according to Tournament Rules, which state players "may" use sleeves. However, playing unsleeved is highly impractical and risky.

Nuances:

• Unsleeved cards are likely to get bent or damaged during shuffling, which would result in marked card warnings unless every card remains uniformly identical
• Judges would pay extra attention and scrutiny to unsleeved decks during deck checks at higher-level tournaments
• At locals/casual events, enforcement is more relaxed, especially during the first month of play