It really could get out of hand quickly, and you can even get creative with the Summons in the deck, too
When he enters the battlefield, you get to temporarily steal an opponents creature
Necropotence was reprinted in Fifth Edition Alliances (1996) had two more cards for card draw, but they arent as impressive
Atraxa's colors give you a lot of options for the best Stax pieces, which can even be tutored for thanks to having black, so you can play cards like Vampiric Tutor to get important Stax pieces out
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So, if you got any old Pokemon cards, it might be worth digging them up to see what they are worth - you might just have your retirement plan there.