Any time you attack with any creature, you can take an attacking Vampire you control and make it a Demon as well as being a Vampire
While Necropotence is undoubtedly an insanely powerful card, I dont think its as essential to having a good time as Black Market Connections
Still, this card is only worth 10 cents, making it one of the weakest bonus sheet cards to open
Specifically, you should run fewer cards at your commander's mana value than you otherwise might
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Historically, blue is the games strongest color, and artifacts are often the most broken permanent type
