It takes the right kind of deck to get this old gal going but when you do she is a POWERHOUSE.
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What is the right kind of deck?
A: A deck that eats cash for lunch, dinner, breakfast and every other meal, but likes to stay slim. Fire Axe+Dark Horse actually likes the cash but doesn't want to stockpile it, therefore Madame Labranche will keep you covered by kicking you up from 0 straight to 2 credits at the end of a round or even juices you up mid-battle while you swing your axe.
B: A deck that depletes cards quickly, this is generally a bit less common bot certain types of Wendy Adams or "Ashcan" Pete really do go through cards quickly and having the Madame Labranche around to jump start you when you hit rock-bottom can be a lifesaver.
If you're the -A- kind of investigator then seriously consider this chick in your deck. Heck even consider Charisma rather then swapping her out for some XP ally like Yaotl or Peter Sylvestre later. If you're the -B- kind then pass this girl by unless you think you can trigger her for the cash part every now and then too, if you plan to sit on a payload of cash, for the sake of playing something expensive down the line, then this gal probably wouldnt be much help at all.
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Some tricks to consider/Remember:
The icon means that triggering it is optional whenever you feel like, this means that you can simmer a bit at 0 resources or cards if you feel like it for some reason, for example during a combat check with a Fire Axe and Dark Horse.
When you're committing cards to a skill test, there is a player window between the cards being committed and the result known, this means that if a card like Guts is the last card in your hand, and you play it on a check, you can trigger Madame Labranche before the skill becomes successfuly and Guts triggers the draw effect.