Spells and Victories.
The following missions have been added for the Limit One Festival in Master Duel. In total, each category will net you 250 gems for a total of 500 gems.
Furthermore, the official OCG Youtube channel uploaded videos showing off some of the things you can do with the Loaner Decks in case you are not familiar with them. Of course, they are in Japanese, but you can probably figure them out from the visuals:
Borrel Deck:
Agent Deck:
Reptilianne Deck: