Robin is only featured in one insert set in this years Triple Threads but that also comes with a 5 parallels. Still the base card is numbered only to 36 so these will be pricey relic cards. Robin is in the Relic Legends set. I'll add images after these start hitting the market next week.
Relic Legends Base #/36, Sepia #/27, Emerald #/18, Gold #/9, Sapphire #/3, Ruby 1/1
TTRL-RY Robin Yount