Merchant Village
cost $3 - Action
+1 Card
+1 Action
+1 Buy
You may play a Merchant Village from your hand.
Gain a Merchant Village.
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There are 20 copies of Merchant Village, rather than the usual 10.
This completely outclasses Market Square when there are no trashers.
Beyond that, I’d say it outclasses Village and maybe Worker's Village as well. With the self gaining, it should be very common for them to collide multiple times per turn.
Fmm... this is a Village only when two collide. In 20-card deck, how reliable? This is not worth $4. Enormous Buys aren't so great.
I totally disagree. Due to the unconditional self-gaining this would be a very powerful $4, perhaps even stronger than Port.
A simple nerf would be conditional self-gaining, e.g. "You may play a Merchant Village from your hand. If you did not, gain a Merchant Village." That could still be too strong for $4 but at least it is not totally crazy anymore.
How about this?
Merchant Villagecost $3 - Action
+1 Card
+1 Action
+1 Buy
You may play a Merchant Village from your hand.
If this is the first time your played a Merchant Village, gain a Merchant Village.
You can gain only 5 or 6 Merchant Villages (since all 4 players buy and play this if this is overpowering). When you have 20 cards in deck, this is unreliable. Do you still buy this only for Buys? Unlike 4 cost cantrips like Magpie and Rats, this is unsuitable for upgrading.