I can't get a single creature created using the arcane element. Not sure if broken or what
Which recipe have you tried? I will re-check it in the game to reproduce the bug.
In theory, any recipe can be replicated like xxAxx or xxxAxxx where xx/xxx are the recipe ingredients needed to make the unit, A is the arcane element, and following xx/xxx are the repeated elements used before the arcane (only elements count, so you can use different ingredients as long as they have the same element type).