Like most Magic: The Gathering cards, the value of Twitching Doll depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Duskmourn: House of Horror)
Doubling effects will compound and you draw a total of four cards per normal draw
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Another by veteran Mitsuhiro Arita, there are multiple reasons this special underwater-themed card has drawn quite a high price
This one's a Black mana source, and remains as ridiculously powerful as the rest of its moxy brethren
So before going into the specific cards, I'd recommend a once per turn on all of the continuous effects