Well I play a season everyday and some seasons I stay "down" without getting promoted a few seasons to build up euros and RPs, those legend coins have been available to me since L17 I believe and they only appear on average once every 3 days. I was training gold to black because the strikers are like 200 red 120 orange at titanium and not much more for black, and I got Danny Welbeck upto 280 red 157 orange once he reached Titanium, he's level will be insane if I train him all the way upto wild.