Exorcist
Action/Duration - $4
You may trash a Curse from your hand. If you do, gain a Curse and set it aside. At the start of your next turn, put it into your hand.
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While this is in play, all Action cards have an additional "Curse" type
So while Exorcist is in play, you can gain any action card when someone else plays a Witch.
Alternative:
Exorcist
Action - $3
+1 Action
You may trash a Curse. If you do, +3 cards.
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While this is in play, all Action cards have an additional "Curse" type
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When you buy this, gain a Curse.