Gold III. 10k CP. If only put money to upgrade from what I hv(46k) , it takes 5 gold foil legendary cards which currently ~ $500. Besides this, to be able to stay in gold league comfortably. Necessary to upgrade summoner from lvl4 to 6 and related monster cards to higher lvl. By looking at those cost. I want to hold on and keep staying in the silver league until can see certain return then may continue to invest. But on the other hand, the cards price maybe significantly higher than what it is now. A bit difficult to decide.