Thank you so much for taking the time to leave your feedback - it helps me a lot.
It really motivates me to know you find the game loop addictive; that's the main thing driving me to polish every aspect further.
The combination options right now are super minimal, which is why it feels so weak. I definitely want to add more depth by integrating card levels and combinations, and much better visual feedback for the player (I really need to design a way to show possible combinations). Regarding spells, I only implemented one (deals damage to the enemy at the start of combat) - I definitely need to design more, maybe temporary items associated with elements to add depth to the combat system.
The idea of letting players choose their next resources from a card draft is something I'll definitely add to the game. I think it'll add a lot strategically, and it hadn't occurred to me.
Combining consumables with resources is also something I plan to implement in the future, alongside balancing player and enemy stats.
Thanks so much for your observations and advice - it truly helps me a lot.