Local game stores got a jump
Is it not painfully obvious
The decks in this guide are designed to maintain the specific characteristics of the starter deck, namely, all the synergies between heroes, allies, support characters, and songs that are already in the deck
Emerald Lorcana cards tend to prioritise defence and effects over strength, which you could choose to balance by combining it with a more challenge-focused colour such as ruby or support with the protective powers of amber or amethyst
As an MTG card, this puts it in similar company with budget reanimation spells like Miraculous Recovery, though with the artifact flexibility that allows it to be sacced for other purposes if no longer relevant for that turn
But because we know there are cards in those early sets that are important to a lot of fans deck-building strategies, and we know not everybody got the cards they wanted the first year, were re-printing some cards from those first sets in Fabled