When I think of a card based on a voodoo doll, this isn't exactly what I had in mind. I really like the "this will come back to bite you" aspect of the card but there's a of things holding this back. I think the biggest problem with this card is the "must" clause in the first line. If you didn't have to put a pin counter on this every turn, it would be a lot better. The other big problem is the cost. It costs 8 for 1 damage! EIGHT. That's re-donk-u-lus. Flavourwise, I like it. Functionality, I don't like it.
Pros: Colourless sources of escalating damage
Cons: Extremely expensive, can bite you hard