Master Duel players can earn Legacy Tickets by winning Ranked Duels as well as completing Solo Missions, and these tickets can be exchanged for Legacy Packs in the Bonus Pack tab of the Shop
The way it worked was that it gave you a goal to pursue, and if you did it, you were rewarded with a special mechanically unique token
The Jeskai deck actually has two prominent characters as commanders in addition to a dragon, since Shiko and Narset appear on the same card
It gives you a new angle of gameplay that varies from the dynamic start of Farseek into Huntmaster of the Fells
If you would rather ease in, slow fetches like the Mirage cycle (Bad River, Flood Plain, and friends) search the same basic land types but enter tapped, making them a serviceable stepping stone before you upgrade to the real thing
Of course, it also helps that My Hero Academia provides the perfect setting and cast of characters for a CCG to be based around so its no wonder that it became successful among fans of the manga and anime, as well as CCG players looking for a new experience