There are cards out there like Sakashima of a Thousand Faces that negate the legend rule, so putting these two cards in a deck together is a wise choice
The success of the archetype is entirely dependent on building a critical mass of aggro-approved creatures and spells, the grand majority of which are boring one- to two-drops
Common Most commons are bulk, but some can be valuable if they are old, highly playable, scarce, or from a desirable foil printing
Thats the kind of thing that a set like this should be doing, and it absolutely nails it in that respect
Instants & Sorceries - 21
Once I had the cards for it, I ran a control deck that used Gengar and Umbreon to constantly switch out the opponents Pokemon to target weaker basics and move damage counters around to keep the opponent from attacking