To me, this looks like some kind of "superfriends", as I call it. (I don't know the proper term.)
Superfriends
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This is my build for such a deck. Yes, it can be improved, but it'll work like that just fine.
(I would probably remove the siphons for vampire daggers or nightmares.)
I would not add life to it, but if I had to (which I don't), I would add Empathic Bonds.
But, I could see some variant of air working, by replacing the steals/dusk with SouFflé/fog and just running the entire air section of the deck off of an air mark.
As for this thing working against silver/gold: ... Well, Monodarkness does work well against bronze and silver. I don't know how well it works versus gold, however.
Anything that can very easily and consistantly topple monoaethers and discords should be able to grind gold pretty effectively right now, so monodarkness should be at least somewhat effective in gold as of now. The more popular gold and plat grinders is
Pdials and some SouFflé/SoBra rush, because both of these decks pretty much wreck those two builds/cards.
So... I wouldn't recommend using it to grind gold, but it could work.