Basically, achieving these goals will expose you to different gameplay competents and give you experience with them
You can ignore the desert text completely and treat this green sorcery like a bodiless Primeval Titan, or actually play into desert synergies and get a few zombie tokens for your troubles
[11] After E'Rah's defeat, all Evolving "Numbers" came into Astral's possession
Consider yourself lucky if youve pulled them
The good part about Discovery / Dispersal is that its good early and late in the game, and you can cast it with blue or black mana
As with Magic, an ongoing plot takes center-stage to keep dedicated players invested as well (it was apparently the first major work done on Lorcana, with Miller pointing out that the team "wanted to make sure that it didn't feel like we were just putting characters on cards")