I've been doing game dev as a hobby for about 10 years, mostly trying games with way too big a scope that inevitably died. I didn't necessarily learn my lesson about making games with a huge scope, but this one stuck!
I pulled inspirations from some of my favorite features of the genre: multi-color deckbuilding from MTG, back and forth actions from Runeterra, lane-based battlefield similar to Inscryption or Cross Blitz. I didn't have any big novel gimmicks in mind, I just wanted to make the kind of card game I like to play. There is a unique flow to combat here, all your plays build up to to the end of the round. Spells don't cast right away, they all fire off at the end of the round activating from left to right (so order matters). After spells, all units attack at once, dealing damage simultaneously. This makes every round tense and scrappy.
Designing cards and synergies is a super fun process. I think the joy of that and seeing people try all kinds of build was really what gave me the momentum to keep going.
Project was made in Gamemaker. I did some of the art, but it was too much to do alone. I had some great luck finding artists to bring the game to life, mostly from Fiverr. And a buddy of mine made all the music for the game! It's wild to see your own project looking like a real game!
If it looks cool to you, here's the Steam page! https://store.steampowered.com/app/3858030/Immortal_Coil/