Since Mystic (along with most $5 Peddlers) has been officially pooped on by a new card, it seems time to make an improved version of some of those cards.
Mystic
$5 - Action
+1 Action
+$2.
Name a card. Reveal the top card of your deck. If it's the card you named, put it in your hand and +$1.
(just a tweak)
Treasury
$5 - Action
+1 Card
+1 Action
+$1.
-
When you gain this, trash a Treasure you have in play to gain a Treasure costing up to $3 more than it.
(We could have this on-gain effect and the official below-the-line effect of Treasury at the same time, but it probably wouldn't fit on the card, and the official below-the-line effect doesn't really do much.)
Fisherman
$5 - Action
+1 Card
+1 Action
+$1.
-
During your turns, if you discard pile is empty, this costs $3 less.
When you gain this when it cost $5, gain a Horse.
Artificer
$5 - Action
+1 Card
+1 Action
+$1.
Discard any number of cards. You may gain a card onto your deck costing exactly $1 +$1 per card discarded.
While we're at it we can change Baker's Setup to an on-gain effect and remove the drawback from Poacher.
Power creep is a thing. When a card makes other cards obsolete, it can make the game less interesting. I don't want to say this where Donald will read it because when someone creates awesome stuff, it seems pretty rude to pick out the little bits that aren't awesome and complain about them.
...But instead of accepting the power creep, we could just revise Tea House instead. Why not do what Donald said he intended to do with the card in the first place:
Tea House
$5 - Action
+1 Sun.
+1 Card
+1 Action.
If the Prophecy has been triggered, +$2. Otherwise, +$1.
(This post isn't just to complain about Tea House. I printed this version of Treasury before Rising Sun came out and would probably print this version of Mystic even if I don't get Rising Sun (but I probably will get it). The Fisherman and Artificer here are not really serious suggestions, though they'd probably work fine.)