Have around 17€ on gog and willing to fulfill your wish in exchange for Wonder Boy The Dragon's Trap or Driftland Magic Revival from Humble store. For me those are 8€ due to HM discount.
If you're willing to do the trade, I'm willing to cash in 11.99€ for one of those keys
You should gain game worth of 10€ for 12€, or gain more profit from HM subscription.
I'm also willing to do appropriate trade off for you random GOG wishlist, under 12€
Vingry: [HAVE] A Steam wallet key of $20.94
[WANT] Elder Scrolls III: Morrowind GOTY Edition
[GOG] You will gain profit from this trade. Willing to do this trade, also. Will contact you.
Done purchase for Vingry and upper offer is not valid anymore.