Moonstone, Harsh Mistress 
Legendary Creature — Human Doctor Villain
$0.17 #11839 0.00 0.2 years
Flying
Whenever you discard a card, you may exile that card from your graveyard. If you do, until the end of your next turn, you may play that card.
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Cards similar to Moonstone, Harsh Mistress expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
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"Whenever you discard a card, you may exile that card from your graveyard. If you do, you may play that card this turn."
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$0.26↑#7337↑0.13↑1.6 years↑
"Flying"
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"Flying"
Conspiracy Theorist84%
$0.28↑#4374↑0.12↑5.4 years↑
"Whenever you discard one or more nonland cards, you may exile one of them from your graveyard. If you do, you may cast it this turn."
Victor Mancha, Runaway80%
$0.27↑#23401↓0.000.2 years
"When this card enters, exile target card from your graveyard. You may play it for as long as you control this card."
Toluz, Clever Conductor78%
$0.20↑#16461↓0.004.4 years↑
"Whenever you discard one or more cards, exile them from your graveyard."
Bag of Holding78%
$0.29↑#4026↑0.097.2 years↑
"Whenever you discard a card, exile that card from your graveyard."
Currency Converter76%
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"Whenever you discard a card, you may exile that card from your graveyard."
Inti, Seneschal of the Sun75%
$1.72↑#1931↑0.20↑2.8 years↑
"Whenever you discard one or more cards, exile the top card of your library. You may play that card until your next end step."
Rooting Moloch73%
$0.06↓#17069↓0.22↑6.4 years↑
"When this creature enters, exile target card with a cycling ability from your graveyard. Until the end of your next turn, you may play that card."
Kitchen Imp72%
$0.19↑#120660.33↑5.2 years↑
"Madness If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard."
If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard."
Pitchstone Wall72%
$0.17#27069↓0.21↑24.6 years↑
"Whenever you discard a card, you may sacrifice this creature. If you do, return the discarded card from your graveyard to your hand."
Senseless Rage71%
$0.08↓#17708↓0.29↑10.4 years↑
"Madness 
If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard."
If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard."
Skophos Reaver70%
$0.20↑#14983↓0.005.2 years↑
"Madness If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard."
If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard."
Twins of Maurer Estate70%
$0.12↓#17596↓0.0010.4 years↑
"Madness 
If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard."
If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard."
Weirded Vampire70%
$0.08↓#19708↓0.0010.1 years↑
"Madness If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard."
If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard."
Hobgoblin, Mantled Marauder70%
$0.27↑#9023↑0.28↑1.0 years
"Whenever you discard a card, this card gets +2/+0 until end of turn."
Obsessive Search70%
$0.20↑#8003↑0.41↑24.6 years↑
"Madness 
If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard."
If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard."
Arrogant Wurm70%
$2.19↑#25267↓0.12↑24.6 years↑
"Madness 
If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard."
If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard."
Reckless Wurm70%
$0.10↓#15846↓0.40↑19.6 years↑
"Madness If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard."
If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard."