Drawing extra cards each turn is good
Once you have max speed, making a horde of zombies gives you a lot of power, either literally to threaten your opponents or by effectively doubling your stock of sacrifice fodder to make your sacrifice outlets all the stronger
That could affect prices of Black Market Connections, but we doubt it will

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It simply makes the game hurt
Your opponent discards a card per turn, or you can have a 3/5 to block with