Moose contradicts Nomad Camp--how do you gain something to your hand and deck at the same time? Also, if this got added to Goko and you accidentally revealed Watchtower, it would blow the program's mind.
It also is broken with Ill-Gotten Gains in the Kingdom--and gets crazy with King's Court. It also makes 3-piling ridiculously easy with King's Court and Watchtower, but maybe that's a feature, not a bug. It also has a crazy combo with Secret Chamber--but anything that improves Secret Chamber is probably worth pursuing.
Fur Hat--would it be better to just make it cost $6, and then read, "When you gain this, trash a card that you have in play that is not a Copper." That way, you still can't buy it on Turn 1 and 2, and this also limits your ability to Remodel into it (since Silvers won't be in play in your action phase). Or maybe you should have this trash a Treasure that is not a Copper?
Deer--needs to say "discard this from your hand." But it seems like it compares very unfavorably to Market Square, because most of the time it will draw dead. It combos great with cantrip trashers--but how often do you have one of those, plus a Village, plus Deer, in your hand? Sure, it's great against Knights/Saboteur/Swindler--but Knights and Saboteur have pretty weak attacks to begin with. And even then, in many cases you'd rather have the Gold than the 3 cards.
Shooting Trophy--needs to have "When this is in play". But it looks like it would either be awesome or terrible--because it's pretty much worse than Duchy until you start greening, and it can't gain itself, like Horn of Plenty. Is it OP with dual-type Victory cards, though? And is it too powerful with Gardens/Silk Road/Feodum?
Rifle--The value of coin tokens is that you don't have to spend them on the current turn. But in most engines, you don't want your Smithy to be the last card you play--you want to finish with a coin-producer, like Horse Traders, Merchant Ship/Guild, etc. Rifle is either an expensive Smithy or one that is designed to be terminal--neither of which fits your typical engine as well as the cheaper Smithy. That's why there isn't a card in Dominion that gives +2 cards, +1 coin.
Knife is OK in 2 player, terrible in multi-player, where the risk of trashing it is much higher. I'm not sure that the minor reward of getting someone to discard 2 coppers is worth the risk of a wasted early buy. Later on, it's pretty much identical to Militia.
Scope--is almost strictly superior to Lighthouse. It's probably OP at $3.
Camouflage--I like GendoIkari's change.