Finally, I found another card game! I also played with the concept of merging cards, but in a very different way. :P
I liked the base concept here and the selection of cards is solid. Progression also feels good, being rewarded with increasingly more complex cards is nicely done. The idea is simple to grasp but to truly master synergies you need to think of different interactions and optimize your deck so you can pull off the crazier combos. This theme was tough for card games, but I think you captured it in a good way. Well done!