Why does this matter for beginners
Declan is capable of using Fusion, Synchro, and Xyz Summoning and his mastery of them is in the opposite order of that of Yuya Sakaki
It doesn't sound like a lot, especially when you have cards like Keeper of the Accord, which can do similar things every turn, but consider this: the land doesn't have to be a basic Plains, and it doesn't have to enter tapped
Getting it into play and immediately recovering an egg or a fetch land is good value, and you make the most out of this card with self-mill
They came out at the same time as the new Ascended Heroes Elite Trainer Boxes and, much like those boxes, they sold out pretty much everywhere essentially immediately
Unsurprisingly, a handful of these myriad cards can make even the worst of the worst surprisingly playable