MONEY/SILVER
And then we end up blowing them on upgrading skills or buying eggs or extra team modes respins ETC
But I think there should be like a bank.. So you can click your silver down in the corner and like stash some in a different thing, so you don't end up spending all of your money or whatever.. Abit like the lock button for monsters to stop you sacrificing them.. But do it with money

Just a suggestion may help out or may of already been suggested but thanks