After trying out this card with Diana Stanley and Daisy Walker, I have to say I 've had mixed experiences with it.
David Renfield is a swingy card from which you 'll get mixed mileage depending entirely on the scenario layout. While the resource generation, the Willpower boost and the damage soak make David Renfield valuable, you can't always guarrantee you 'll get as much profit out of him as you 'd wish. There are those cases where David Renfield shines, giving you a constant Willpower boost for several turns, while making you rich in the process, but there are also those cases where he 's sitting idle in your hand, waiting for an opportune moment to be played and be exploited, possibly leaving you at an awkward spot or a bad situation. Your mileage with Renfield also depends on how many doom-removing cards you have in your deck. Both times, I had 4; 2 Moonlight Rituals and 2 Calling in Favors. Both times, all of these 4 cards were useful in some way, but they didn't necessarily make David Renfield better. They certainly allowed me to use Renfield more often, but I didn't always get the value I wanted. There were those times that the benefit I was getting was a +1 Willpower boost for a couple of turns and a net-gain of 2-3 resources using 2-3 actions. That's not great value at all. Sometimes I also misinterpreted the situation, which inevitably lead to misplays, making David Renfield even worse. But the worst mistake I did the second time I used him was that I depended almost entirely for my economy on him. And guess what? I was in trouble. Even with 4 cards to remove doom, David Renfield still didn't cut it to guarrantee utility. There were scenarios where my economy was rolling fantastic, but there were also others that I couldn't get as much resources as I needed, thereby severely hindering my ability to be effective. I warn you: Don't make that mistake! But, overall, it was a good experience, mostly finding out Renfield's capabilities and how much you can push your limits.
So, after using David Renfield in 2 campaigns, I have acquired enough experience to point out some tips you can use:
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Never use Renfield unless you have a way to remove doom from him! Probably obvious, but worth pointing out. It's too dangerous.
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You can use Renfield's ability in 2 different ways: Either you stack doom to profit from his moneymaking ability in order to become a hell-of-a-rich guy over the course of a few turns, or keep the doom count on 1 for the constant Willpower boost. Depends on what you need most at a given time and how much the current agenda allows you to go crazy with doom. I was usually abusing the money-making ability, but going the other way is also useful if you don't need as much cash.
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Try to have a lot of doom-clearing cards in your deck. A good Renfield-using deck should have at least 4. The doom-removing cards that exist up until this time are Moonlight Ritual, Calling in Favors and Sacrifice. Having a lot of those gives you options. Besides, if you run Moonlight Ritual, you would also probably go for Blood Pact, so there's kind of some competition for doom-clearing targets. Calling in Favors is usually better than Sacrifice if you also run other allies in your deck, especially if they like to be recalled (like Beat Cop and Mr. "Rook").
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Be aware of scenario cards and mechanics that interact with doom. Cards like Ancient Evils or a badly-timed Mysterious Chanting can ruin your day. Be prepared to face them and run cards that can deal with them, like Ward of Protection.
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Removing doom from Renfield costs an action. You should bear that in mind if you 're playing with fire. If, for example a strong enemy spawns at your location during the turn you were planning to remove the doom and you need all 3 actions to deal with it, you will be in trouble. That is why it may be good to pack some actionless way to remove doom from David Renfield like Forbidden Knowledge.
I would also like to point out a few investigators who can make good use of David Renfield:
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Marie Lambeau is probably no 1 candidate to use Renfield due to her ability. In my opinion, David Renfield is the best card that uses the doom element she can use, probably even better than Blood Pact. Even though Blood Pact is a permanent, it's not as solid as using Renfield for her, as she needs to first find a target for it, while David Renfield gives her solid access to her special ability so that she can start using it whenever she wants.
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Mutated Dr. Christopher also makes Renfield a good candidate for Daisy Walker as an alternative way to make resources, especially if she wants to use spells from the faction. The constant Willpower boost from him along with other boosters like Holy Rosary or St. Hubert's Key will make her a decent fighter and she can use Arcane Studies or Higher Education to help her land those hits.
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Diana Stanley can use the extra Willpower boost and the resources gained from Renfield, especially early game. In my experience, she's been a rather resource-hungry investigator and she wants an alternative way to generate resources until she upgrades to "I've had worse…" (2).
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I can also see this card in a spell-heavy Jim Culver/Father Mateo build. Spells are expensive in the first place and none of these investigators is known for their expceptional Willpower. Father Mateo also has the additional benefit of being able to toy with doom in more interesting ways.
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As pointed out by another reviewer, this card makes for an interesting case in "Ashcan" Pete. He can use his ability to trigger Renfield twice a round, possibly being able to make huge piles of resources. The main issue here is whether he needs that Willpower boost and somewhere to put all those resources into, but I can see a spell-oriented deck for him with Renfield + Peter Sylvestre (2) for the Willpower boosts plus Shrivellings/Withers/Sixth Senses/Rite of Seekings and Pluckys to put all those resources into, protected by Peter Sylvestre's infinite horror soak. It 's somewhat janky, but someone might make it work. Also note that the upcoming Versitile card will allow him to take 1 additional Mystic card, possibly giving more (?) consistency to this build. Just saying...
In the end, I think David Renfield is a good card. He 's generally good for investigators who need the Willpower boost and can use the extra resources. His value varies from scenario to scenario, but in the end, you will (almost) always find some room to make some value out of him. He 's probably not as good to investigators with innately high Willpower (Agnes and Akachi) and whoever is running him has to bear in mind that he can not fully rely on Renfield for the hard stuff.