Fun Cards Submission: 2018 Topps Ken Griffey Jr. by Lanny Ribes!
I was surprised when I made the list of Ken Griffey Jr. cards and which Topps designs he had appeared on, the largest chunk of missing years was the last nine. From 2011-2019, he was only in the 2013, 2017, and 2019 official sets. There may be some other customs out there, but I did not come across any during my sparse research for my post. Lanny Ribes hits us with a 2018 Topps design today, so you can check that one of the list.
I will go back and update that initial post every few days with links to online custom cards. If you know of any, even if there is another card in existence, let me know so I can add it to the list!