Are sleeves with holographic patterns on the back tournament legal at high OPL?

Ruling: Sleeves with holographic patterns on the back are not legal at high OPL according to the tournament rules, though some players have used them in official events without issue.

Nuances:

• The restriction exists to prevent accidentally revealing hidden information through reflections when cards are held above sleeved cards
• This is particularly relevant when cards are drawn, flicked, or placed slowly in stacks
• Double sleeving with matte outer sleeves may reduce reflectiveness enough to make them acceptable
• Individual head judges may make different determinations, so having backup sleeves is recommended