As I mentioned, mana values are based on an objects mana cost
I learned how to read rosettes, the best way to do water tests without damaging real cards, light and blacklight testing, even rip and bend tests, until I felt fairly certain I could spot a fake were one presented to me
This is just great card draw, plain and simple
3 Green Sun's Zenith A card that can place any creature from your deck onto the battlefield is likely going to be powerful
Depending on your list, you might even be able to sneak a little extra Koma protection in ahead of time, with a changeling or the actual best Serpent in the format Thats right, Yorion
The best aggro decks in Disney Lorcana tend to make heavy use of Amber at the moment, so it's also easy to transition from the starter deck into aggro play with the addition of some key cards