In my experience
Derufin is kinda hit or miss. If they get their
Ships of Great Draught out retrieving each other, often times they can get stuff out faster than
Derufin can get rid of it.
The only way to actually "stop"
Corsair Marauder, as far as I know, is by the old
![Shire [Shire]](https://lotrtcgdb.com/forums/Smileys/classic/shire.png)
method of
Shadowplay +
Unheeded. Using that, you can kill a
Corsair Marauder before his text can trigger.
Alternatively, if you're running heavy
![Gandalf [Gandalf]](https://lotrtcgdb.com/forums/Smileys/classic/gandalf.png)
, you can load up with
Roll of Thunder to ditch his
Black Sails of Umbar, and
A New Light to get
Corsair Marauder out of his hand before he can play him. But again, hit or miss.
I like to use a Madril deck in Expanded, and what I do when I'm encountering a Corsair deck, is I switch to "Corsair Mode." This entails a number of things:
1. Assume that any possession you have, you probably won't keep more than a turn. So, don't depend on them. Also assume that Madril won't be able to make stuff roaming, because of
Ships of Great Draught.
2. Get out
Throne of Minas Tirith asap, along with some conditions to put tokens on. A set up
Throne of Minas Tirith can disable a Corsair deck pretty quickly.
3. Get out
Don't Look At Them asap, and use
Smeagol, Always Helps to kill off any of the larger Corsairs.
4. Protect conditions from
Discovered with
Gandalf, Wise Guide.
Since Corsairs only have a couple of really good combat-ready minions (
Castamir of Umbar and
Black Numenorean), once you eliminate their ability to recycle guys with your Throne, they don't have a whole lot of teeth.