The Limit One Festival for Master Duel will be held from June 16th to June 27th, timezones applying. As the name suggests, you can only use 1 copy of every card in your Main Deck and Extra Deck. The May 2022 Forbidden & Limited List still applies for Forbidden cards, and additionally, the following cards have been forbidden for the event:

Forbidden:
Dinomight Knight, the True Dracofighter

Number 1: Numeron Gate Ekam
Number 75: Bamboozling Gossip Shadow
True King of All Calamities

Crystron Halqifibrax
Isolde, Two Tales of the Noble Knights
Predaplant Verte Anaconda
Union Carrier

Fusion Destiny

Imperial Order
Skill Drain

There are 3 Loaner Decks which you can use if you are having trouble building your own Deck: A Borreload/Topologic Deck featuring Borrelcode Dragon, a Sanctuary in the Sky/Agent Deck featuring the new Fairy monsters, and a Reptilianne Deck featuring the new Reptile monsters.

You can earn medals by playing Duels and you can obtain the following rewards according to the number of medals you have:
50 to 11000 medal threshold: a total of 2300 gems
12000 to 21000 medal threhshold: a total of 20 Legacy Pack tickets
Additionally, at the following thresholds, you can get these rewards: