Player X plays a Witch
Player Y gains a Curse
... revealing a Trader to gain a Silver instead of a Curse
... revealing a Partition to gain a Squire instead of a Silver
... revealing a Watchtower to trash the Squire
... gaining a Goons
... ... revealing a Partition to gain a Cache instead of a Goons
... ... gaining 2 Coppers
... ... ... revealing a Trader to gain a Silver instead of a Copper
... revealing a Partition to gain a Squire instead of a Silver
... revealing a Watchtower to trash the Squire
... gaining a Cultist
... ... revealing a Watchtower to trash the Cultist
... ... drawing 3 cards
... revealing a Trader to gain a Silver instead of a Copper
... revealing a Partition to gain a Squire instead of a Silver
... revealing a Watchtower to trash the Squire
... gaining a Goons
... ... revealing a Partition to gain a Cache instead of a Goons
... ... gaining 2 Coppers
... ... ... revealing a Trader to gain a Silver instead of a Copper
Repeat.
+15 cards instead of a Curse, anyone?
Not even counting those Caches you get for free.