Dementia Bat 

Creature — Phyrexian Bat
Flying
{4}{B}, Sacrifice this creature: Target player discards two cards.
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Cards that do something similar expected a card that isn't here?
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Shattergang Brothers 89%
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"{1}{B}, Sacrifice this creature: Each nontoken Vampire creature you control gains persist until end of turn."
Corpse Traders 82%
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"{2}{B}, Sacrifice a creature: Target opponent reveals their hand. You choose a card from it. That player discards that card. Activate only as a sorcery."
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"{2}{B}, {T}, Sacrifice another creature: Target opponent loses life equal to the sacrificed creature's toughness."
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"{1}{B}, Sacrifice this creature: Look at target player's hand and choose a card from it. That player discards that card. Activate only as a sorcery."
Ecstatic Awakener // Awoken Demon 80%
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"{2}{B}, Sacrifice another creature: Draw a card, then transform this creature. Activate only once each turn."