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Growth is a Prophecy from Rising Sun. Once it is activated, whenever anyone gains a Treasure they also gain an additional card cheaper than the Treasure.
This can chain; you could gain a Platinum, gain a Gold due to Growth happening for Platinum, gain a Silver due to Growth happening for Gold, then gain an Estate due to Growth happening for Silver.
This is not optional; if you gain a Treasure, you have to gain a cheaper card if you can.