i was pleasantly surprised to learn that there was another card release featuring steve garvey in 2018. i didn't know what to expect when i first saw the checklist for leaf's in the game used sports set, but i think they did pretty well for an unlicensed issue.
using the backs of jerseys works for me, and the first card i picked up was this 'classic rivals' card that focuses on the 1977 world series
garvey (and the penguin) also show up on a different 'classic rivals' card - this one focused on the 1978 pennant chase card with division rival members of the big red machine in pete rose and johnny bench.
this set is a multi-sport release (similar to the 2002-03 upper deck superstars) and so there is some cross referencing based on cities. this is the los angeles city of champions card (the purple parallel, anyway)
last but not least, garvey gets a spot on one of the multi-mvp 'mvp 8s' cards
these are a great addition to my steve garvey collection and i think a good example of unlicensed relic cards done pretty well.