How about:
Manna |
You may reveal a Treasure from your hand and set it aside. Otherwise, discard this. If this is no longer in play, put the set aside cards into your hand. Otherwise, at the start of your next turn, play this. | $4 ACTION - DURATION |
Let me puzzle through this:
Turn 1: You play it. You reveal a Copper and put it with Manna. It is still in play, so the Treasures (Copper) stay there and it will do something next turn- you don't discard it.
Turn 2: You pick it back up and play it (does it lose track of the Copper from Turn 1?). You reveal a Silver and put it with Manna. It is still in play, so the Treasures (Copper and Silver) stay there and it will do something next turn- you don't discard it.
Turn 3: You pick it back up and play it (does it lose track of the Silver from Turn 2?). You don't reveal a Treasure, so Manna is discarded. It's no longer in play, so you put the Treasures (Copper and Silver) into your hand. Because it is not in play, it will not do anything next turn. You would discard it, but it's already gone.
Procession:
Turn 1: You play Manna with
Procession. You reveal a Copper and put it with Manna. You play it again. You reveal a Silver and put it with Manna. Manna is trashed and you gain an Action costing exactly $1 more than it. Manna is no longer in play, so the Copper and Silver jump back into your hand. Manna is no longer in play, thus it won't do anything next turn, so
Procession is discarded correctly.
I think, assuming the Treasures don't get lost when you pick Manna back up to play it at the start of each turn, this works, though it is clunky and odd with
Conspirator.