Great play aid. I really wish the actual tiles in the game were larger, or the iconography clearer and more distinct by type, as it would enhance gameplay.
Just had word from the designer Ulrich Blum that the description of Assemblage is not exactly correct. He says:
"As pictured on the tile, the color you swap to must be already present in the barrel at this point. So you can never swap into a color you don't have in your vineyard. Otherwise the tile would be to powerful."
I will update the tile aid tomorrow! It should read something like: "swap any number of cubes of one colour on a barrel, for cubes of another colour which matches cubes already present on the barrel."
