If you already had 3 copies of the highest treasures available in hand, the Storyteller with +1 sifting also cannot draw more. The analogy holds as far as the sifting aspect, which is all it was intended to hold for. In the case of Stables it's a simple binary outcome, discard a treasure and get a net of +2 cards or don't. And that simplicity is what makes it a useful analogy, the cards aren't directly comparable beyond whether sifting helps them hit something and I was not saying that they were.
Look everyone, sifting is a good thing and that's why cards like warehouse and cellar exist. But doing so for 1 card to check whether it is a treasure -- and if it is a treasure, may or may not be one you want to play as part of the 3 that you get to play with Storyteller -- is a small effect. Offhand, I'm not even sure if the effect is greater than adding a Pearl Diver to your deck. Probably smaller.
Hey, I asked if you were only focusing on that 1 card sifting, and pointed out that there is more to consider:
Maybe you mean, it's 1 card sifting difference because you potentially play out 1 extra treasure and no more. I guess you aren't considering the extra draw that comes out of that treasure play? I suppose you may ignore that for discussion of "sifting", but the extra draw is an important consideration and it makes the +1 card vs. +$1 very, very different.
And all this is pertinent because it speaks to why having +1 card would change a lot more than just 1 extra card of sifting, as you originally asserted:
I'm curious why it gives +1 action and +$1 instead of just saying +1 action +1 card, as these will amount to the same thing. Is there some interaction here that I'm missing? Overall a really cool card though!
They are not the same at all.
Having +1 Card instead of +$1 would make it *more* powerful, because you could draw your third Treasure to play, if you only had 2 in hand to begin with.
Sure, but it is a 1-card sifting difference. Most of the time +1 card or +1$ amounts to the same effect here.
Sure, the card isn't going to draw you more if you already had 3 copies of the highest treasure in hand. It also isn't going to draw you more if that +1 card doesn't draw you another treasure. The point is that it
could draw you more, potentially a
lot more. And it's never going to draw you less.