Taking extra turns has always been a cool mechanic in Magic, however, its not nearly as fun for the person on the other side of the table
Choose how you are sending the cards You can place your secured cards into a Plain White Envelope (PWE), a Bubble Mailer or a box (if shipping other items at the same time)

Event Schedule Midweek Magic August 13: Alchemy August 810: Slow Start August 1517: Historic Pauper August 2224: Brawl Quick Draft August 15: Dominaria United August 1529: The Lord of the Rings: Tales of Middle-earth August 29September 15: March of the Machine Other Events July 25August 3: The Brothers War Premier Draft August 314: Magic 30: Mixed-Up Premier Draft August 1421: Throne of Eldraine Premier Draft August 26-27: Arena Open (Arena Cube Draft) Premier Play August Qualifier Play-In (Best-of-One) August 5, 6 AM PT Format: Explorer Qualifier Play-In (Best-of-Three) August 11, 6 AM PTAugust 12, 3 AM PT Format: Explorer Qualifier Weekend August 12, 6 AM PTAugust 13, 4 PM PT Format: Explorer July 2023 Ranked Season Rewards The June 2023 Ranked Season begins June 30 at 12:05 PM PT and ends on July 31 at 12 PM PT (UTC-07:00) Bronze Reward: 1 The Lord of the Rings: Tales of Middle-earth pack Silver Reward: 1 The Lord of the Rings: Tales of Middle-earth pack + 500 gold Gold Reward: 2 The Lord of the Rings: Tales of Middle-earth packs + 1,000 gold + Shadow Summoning card style Platinum Reward: 3 The Lord of the Rings: Tales of Middle-earth packs + 1,000 gold + Shadow Summoning card style + Press the Enemy card style Diamond Reward: 4 The Lord of the Rings: Tales of Middle-earth packs + 1,000 gold + Shadow Summoning card style + Press the Enemy card style Mythic Reward: 5 The Lord of the Rings: Tales of Middle-earth packs + 1,000 gold + Shadow Summoning card style + Press the Enemy card style Read the original article from WotC.

Source: Packs come from sealed cases of Mcdonald toys to ensure they have not been tampered with
Its not tied to a permanent, like Kalemne herself, but works like an emblem in that its very hard to interact with