Now I'm not sure if I've got this right, i dont want to use it yet but wondering if maybe someone on the tw team could answer (unless someone else knows for sure). I have a 23% coin cost flag. I also have a flag booster, a noble decree and a royal streamer. Adding that all up i assume i get 79% off of coins. My question is do these 3 items actually stack? i know the flag booster and noble decree do but the royal streamer with them is what i'm not sure about.