Inventor
$6 - Action
+1 Action
Trash a card and discard a card. If this is the first time you played an Inventor this turn, do this twice: select an Action card from the Supply and play it.
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At the start of Clean-up this turn, return cards selected by Inventor that are in play to the Supply.
Simply based on wording of current cards, I would alter this slightly:
+1 Action
Trash a card from your hand. Discard a card. If this is the first time you played Inventor this turn, do this twice: Choose an Action card from the Supply other than Inventor and play it.
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At the start of Clean-Up, return the chosen cards to the Supply.
This way it sort of parallels Golem, Crossroads, and Remake. It still does weird things to Duration cards, but that is unavoidable.
Splitting up the trash and discard is fine. That's a good change, I think.
To parallel Crossroads, it should say "first time you played
an Inventor", which is how I had it. Your change makes it different!
This card is like Golem in function, but not in wording. Not sure how either yours parallels it. Mine already followed Remake; yours doesn't change that. The capitalization? OK, there's that.
The "other than Inventor" clause is unnecessary clutter -- playing multiple Inventors is fine thanks to the Crossroads-style wording.
On the words "select" vs. "choose"... this one is tough. I couldn't think of a representative card because no official card actually takes a card from the Supply temporarily. Since it's temporary, we want to avoid "gain" and all the things that would entail. For tracking purposes and since the idea actually moves cards into play, "name a card" is off the table as well. Since the effect is rather unique, I thought a new word would be best. I don't think an official card says "select". On the other hand, I think the word "choose" is typically used for actual choices, e.g. Pawn, Steward. That said, Scheme has "choose an Action card you have in play", so that might be an acceptable change.
As for the below-the-line text, I used Scheme as a reference. Scheme says:
At the start of Clean-up this turn, you may choose an Action card you have in play. If you discard it from play this turn, put it on your deck.
To follow it, I include "this turn" and specify "in play". The latter also helps prevent confusion from people who might otherwise try to return trashed cards or set-aside cards.
So, OK, taking your suggestions into account (and also adding in the balance changes I suggested earlier
):
Inventor$7 - Action
Trash a card from your hand. Discard a card. If this is the first time you played an Inventor this turn, do this twice: Choose an Action card from the Supply and play it.
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At the start of Clean-up this turn, return the chosen cards you have in play to the Supply.
