Ok, I've been waiting almost 3 months for this day. Ratcatcher has now been revealed, and I really want to see what people say about this cantrip trashing discussion now.
When I first saw Ratcatcher, I didn't understand how it could exist. Cantrip trashing for $2. Ok, so of course the reserve makes it a little different from the hypothetical card discussed here. Being a reserve means 2 drawbacks. It will miss the shuffle more often, like a Duration. And, you get the benefit at least 1 turn later than normal. Though that only matters if you reshuffle during that turn. Oh, also since it only works at start of turn, you can't rely on drawing the cards you want to trash during your turn. But on the other side, it has things that make it better than normal cantrip trasher; mainly that it never becomes a dead card or a risk to play. And you never have trouble lining it up with your junk.
Anyway, it was said here that cantrip trasher is far stronger than cantrip coin, and that it cannot cost less than $4. I would have agreed, except I'd seen Ratcatcher. Now I don't know what to think. Should you open double Ratcatcher every time? Does it cost $2 because at $3 it would be unfair to someone who opens 5/2, like Chapel? Is Hospital balanced because Ratcatcher exists?