Specter of Mortality 
Creature — Specter
$0.16 #23263 0.41 3.1 years
Flying
When this creature enters, you may exile one or more creature cards from your graveyard. When you do, each other creature gets -X/-X until end of turn, where X is the number of cards exiled this way.
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Cards similar to Specter of Mortality expected a card that isn't here?
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$0.47↑#1768↑0.88↑7.5 years↑
"When this card enters, each other creature gets -1/-1 until end of turn. Whenever a creature dies this turn, each creature other than this card gets -1/-1 until end of turn."
Miasma Demon76%
$0.19↑#199470.05↓2.1 years↓
"When this creature enters, you may discard any number of cards. When you do, up to that many target creatures each get -2/-2 until end of turn."
+1 more matching line
Dream Spoilers75%
$0.14↓#196230.25↓3.1 years
"Flying"
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$0.14↓#15574↑0.06↓2.2 years
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$0.32↑#264120.10↓29.4 years↑
"Flying"
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$0.13↓#14768↑0.17↓5.3 years↑
"When this creature enters, you may exile two cards from your graveyard. When you do, return target creature card from your graveyard to the battlefield."
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$0.10↓#32007↓0.00↓29.0 years↑
"Flying"
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$0.08↓#30769↓0.00↓14.0 years↑
"Flying"
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$0.02↓#244320.27↓33.2 years↑
"Flying"
Mahamoti Djinn72%
$0.09↓#256460.00↓33.2 years↑
"Flying"
Bog Imp72%
$0.06↓#273110.06↓32.2 years↑
"Flying"
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$0.02↓#27920↓0.00↓11.0 years↑
"Flying"
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$0.17↑#29989↓0.00↓29.5 years↑
"Flying"
Territorial Roc72%
$0.02↓#28691↓0.00↓11.6 years↑
"Flying"
Leonin Skyhunter72%
$0.18↑#16316↑0.19↓23.0 years↑
"Flying"
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"Flying"
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"Flying"