Konami currently has a promotion going, where 100 people will be randomly selected to receive 100 special card sleeves each. All you need to do is go to this Tweet, and reply with your favorite Xyz Monster, while adding the hashtags #Sweepstakes and #YuGiOhMASTERDUEL. Don't forget to add the tags, otherwise you won't be elligible.

The sleeves themselves are a physical version of the 'Xyz Black' Master Duel Protector that you unlock by increasing your Duelist Level to 5:

The giveaway is available to people in the United States and Canada (minus Quebec). You can find the terms of the promotion here.

Quote From YGOMasterDuel

The Xyz Festival is available now to play in #YuGiOhMASTERDUEL!

Reply to THIS TWEET with your favorite Xyz Monster and be entered to win a pack of physical MASTER DUEL Card Sleeves!

Don't forget to add tags #Sweepstakes and #YuGiOhMASTERDUEL in your replies!

100 randomly selected winners will each win one physical pack with 100 Card Sleeves per pack.

The Promotion will begin on February 17, 2022, 9:00 AM Pacific Time ("PT") and end on February 25, 2022, 11:59 PM PT (the "Term").

Update: The promotion is also available to UK, Swiss & EEA residents via this Tweet. No hashtags needed for this one. You can find the full terms here.

Quote From Yu-Gi-Oh! Card Games (KONAMI Europe)

The Xyz Festival is available now to play in #YuGiOhMASTERDUEL! Reply to THIS TWEET with your favourite Xyz Monster and be entered to win a pack of physical MASTER DUEL Card Sleeves!