Containment Construct 
Artifact Creature — Construct
$0.22 #1858 0.19 4.5 years
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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Cards similar to Containment Construct 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.
Moonstone, Harsh Mistress96%
$0.17↓#11839↓0.00↓0.2 years↓
"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."
Conspiracy Theorist89%
$0.28↑#4374↓0.125.4 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, Runaway84%
$0.27↑#23401↓0.00↓0.2 years↓
"When this card enters, exile target card from your graveyard. You may play it for as long as you control this card."
Rooting Moloch74%
$0.06↓#17069↓0.226.4 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."
Toluz, Clever Conductor73%
$0.20↓#16461↓0.00↓4.4 years
"Whenever you discard one or more cards, exile them from your graveyard."
Bag of Holding72%
$0.29↑#4026↓0.09↓7.2 years↑
"Whenever you discard a card, exile that card from your graveyard."
Hobgoblin, Mantled Marauder70%
$0.27↑#9023↓0.281.0 years↓
"Whenever you discard a card, this card gets +2/+0 until end of turn."
Currency Converter70%
$0.43↑#2685↓0.38↑4.4 years
"Whenever you discard a card, you may exile that card from your graveyard."