Cards I generally skip sea hag for: masquerade, ambassador, young witch, jack.
I don't think skipping sea hag to go for moneylender into mountebank is good. Sea hag's attack is better, and hits sooner (they are drawing curses before they even buy a mountebank). And if there's no way to trash curses, you probably don't want to trash your coppers in a curse game, so moneylender loses a lot of appeal.
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On another topic, I guess I should update this to include hinterlands cards. Here are my initial thoughts:
- Jack is obviously quite good. Maybe it belongs with Masquerade and Ambassador, but probably at least with salvager.
- Trader might fit in with the last tier since trashing estates into multiple silvers can be nice, but then it falls into the remodel problem, where you can't really buy anything on the trader turn, so you're slow to get to the big stuff, and you're expanding rather than trimming your deck, so you're not even going to get your late good cards more often (the way you would with chapel/remake/steward). I think it's probably more situational and depends on if you think you can get something good out of the reaction portion of the card.
- At first blush, both Oracle's effects seem slightly weak, so it doesn't seem like a generally good opening, but I don't know. Since you spy before drawing, you're pretty likely to be able to fetch $2 out of it (the usual bonus for a sub-$5 terminal attack) plus you get the cycling benefit. And the attack can really mess your opponent up if you skip one of their opening buys (30% chance), and at the least, it's about like fortune teller. So it's at least not a *bad* opening, but is it good enough to be on this list? I'm not sure. Early returns don't have it doing well on CR.com, and I haven't used it enough to make a strong opinion.
- Develop seems too situational, more like remodel than salvager. I'm pretty sure it won't be on the list.
- Nomad camp is situational because it depends on how useful that +buy is going to be early on and/or how much risk you're willing to take to go for $5 on turn 2 (given that you draw $4 on turn 1). It's cute, but not generally strong, I think. It also won't likely make the list.
- There may be something cute with Noble Brigand's ability to cause a shuffle before your opponent's second buy, but it seems unlikely that it's a generally good opening.
- And finally, Duchess is obviously not worth opening.