Color dictated some slots (Vraska, for example, was the only black-green planeswalker in the set and thus had to be hybrid) as did slot placement (ten cards had to be monocolor uncommons), but mostly it was based on what rarity the best design for each planeswalker felt most suited
Phyrexian Tower which can be tutored by Crop Rotation, Culling the Weak, Burnt Offering, Nature's Claim or bounce spells like Snapback and Suspend will get the job done
The higher the grade, the more value it has. Pratte happens to know the grades of all the other existing Illustrator cards out there, because Ive been doing this too long, he said with a laugh
Artifact creature spells gaining sunburst because of Lux Artillery means that they getting +1/+1 counters based on how many colors of mana you use to cast the spell
Choosing white as your second color changes your focus from enhancing single attackers to buffing a whole team
In general, I find a lot of new aggressive mechanics sort of dull