During a deck check in Round 15 at Mythic Championship II, the judge staff noticed an issue with Yuuya Watanabe's deck where the sleeves of his Urza's Power Plants were marked in a specific way. Three Urza's Mines and one Urza's Tower had a different marking, and three Urza's Towers and one Urza's Mine also had a different marking. No other cards in the deck nor sideboard had any of these marks. The judge staff determined that the odds of this happening by accident were close to nonexistent, and disqualified Watanabe from the event.
This infraction will be further investigated by the MPL, according to Wizards of the Coast representatives.