Question about 2015 Rank 4 Gems
So I have a 2015 Tech Rank 4 Gem that I earned from Ultron’s Assault. I haven’t used any of these gems before but had heard they using them required no gold, and it shows no gold cost when looking at the rank up screen. I was planning on using it on my newly acquired OG Vision but when I attempt to use it I get a message…