Good catch on the Tourmaline gem being absent, I'll fix that for the next update. Also really like the idea of sacrificing the potency of one the ingredients on your shelf to increase the potency of the ingredients offered on the reward screen - definitely making a note of that.
Yeah, the Catalyst Elixir especially might be a little underpowered atm. It suffers really hard from junk ingredients.
The concept of some kind of sideboard is definitely interesting - I'll have to consider how I'd implement such a system. 🤔