Commander tax is an additional cost while affinity is a cost-reduction mechanic, and additional costs are applied to a spell before cost reduction
In fact, if anything, they hark back to some classic deck archetypes from years ago
And Obscura Interceptor is the most annoying kind of counterspell, adding to the board and likely gaining life at the same time it sets the opponent back a turn
Legions created a problem for us because at the time small sets had 55 commons, 44 uncommons, and 44 rares
Ruthless Regiment isnt far behind
It makes one creature incapable of blocking, which doesnt really have an effect in Commander, makes the Ring tempt you, which is okay but uninteresting (more on that later), and it tutors a Mountain onto the field