In addition to this, a big part of the reason these cards were so popular was because the mana in that Standard format was quite bad, to the extent that you were pretty close to wanting Attune with Aether in your decks even before the energy bonus, but once you have the energy bonus you might as well play Harnessed Lightning, which means you may as well play Rogue Refiner to power up your kill spell, and so on
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Firstly, she taps for mana, and when that mana is spent on a creature, it enters with two +1/+1 counters on it - representing her literally summoning a powerful monster to the battlefield
You can read more about it here.
Negative Ability: Her personal weakness, Baron Samedi, takes up an ally slot, and, for as long as he stays in play, increases any damage taken by investigators at her location
12 of these cards came from the Magic MicroProse game in 1997, and the other 10 from Magics Japan-exclusive Dreamcast release in 2001