URBana, SS and UW are probably going to be better, but URG is at least an interesting combination that hasn't been seen for a while. Let's try and get a decent build in those colors.
The mana base needs work - namely, a few basic Islands.
Spiketail Hatchling is generally pretty bad. If you want a mana denial creature, Gorilla Shaman is a better bet. It's more important that your creatures present a clock, though. Wild Mongrel should be pretty solid.
3-4 Null Rods should be in here. They're almost a necessity of Fish decks, although you could also substitute something like Chalice.
Ninja of the Deep Hours is probably a better draw engine than Curiosity.
Ancient Grudge seems like one of the best reasons to play red and green. I'd try running a couple maindeck.
And yes, this
is old-school.