I heard that there is no card with 'gain a $4 card, put it into your hand' because it would conflict with nomad camp. But how about this?
Factory v.2 $3
Action-Reaction
+1 action
Gain a card costing up to $3 except Factory
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When you gain a card, you may reveal this. If you do, put the gained card into your hand.
Factory $4
Action-Reaction
+1 action
Gain a card costing up to $3.
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When you gain a card, you may reveal this. If you do, put the gained card into your hand.
The reason why unlike workshop, which can gain itself, Factory can't gain itself because two factories in hand can piledrive the whole factory pile.
Generally, you need to have two in hand to become powerful, but when you do, this can be putting a silver or fishing village or some other power card into your hand!
(Note that you can play any gainer, like Workshop, but its's rare for them to be in the same game.)
A few points that I don't like about this card:
1. This is as swingy as TM to collide. Maybe it should cost $3, but not allow it to gain itself?
2. Does this wording still conflict with Nomad Camp?
Feel free to comment anything good or bad about this card, and how it can be improved. Also inform me if there is a thread with a similar idea.