Legendary creatures have a whole set of rules that apply to them, but for the purposes of this article, all you need to know is that a legendary creature has the Legendary Creature text on it, like [c]Kenrith, the Returned King[/c] below
Urzas Saga is a huge boon here, letting you tutor up any of your key cards free of charge
First off, the set has several mini-cycles across the decks, kind of how the various Doctors were clustered together in different Doctor Who decks
Sun Droplet and Chalice of Life are both repeatable lifegain engines you can use that net you the same as Juju Bubble, but without the dont play other cards restriction
Card Mechanics for Disney Lorcana Resource Cost - At the top left side we can see the resource cost, which is likely called Ink
If I can steal the curve of Katakuri / Saka I will go for it