I think while gold for silver would be nice, but it is not to hard to gather a million silver a day if you play lots. I could see maybe 1 to 5 mil per 100 gold coins, but not anything less than that as it would be far or easy to farm in huge amounts. I personally would like to see grade boosters buy able for 100k to 1mil range as that would mean you could spend a lot of time farming for all of those rares at a decent rank since I don’t want to think how long it will take to find every starter and hatchling in S rank, and use your time leveling them up and doing the infinite dungeon to get silver to spend on raising those grades up since grade while it still will matter in pvp after the update will not be so insanely over powering as it is now.
lol if you play lots… that doesn’t make it any easier & less time consuming…