Containment Construct 
Artifact Creature — Construct
$0.26 #1848 0.23 4.7 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%
$0.19↓#10857↓0.230.3 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%
$0.26#4372↓0.13↓5.5 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%
$0.25↓#22425↓0.10↓0.3 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%
$0.08↓#17401↓0.256.5 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↓#16779↓0.224.5 years
"Whenever you discard one or more cards, exile them from your graveyard."
Bag of Holding72%
$0.24↓#4042↓0.03↓7.3 years↑
"Whenever you discard a card, exile that card from your graveyard."
Hobgoblin, Mantled Marauder70%
$0.25↓#8745↓0.06↓1.1 years↓
"Whenever you discard a card, this card gets +2/+0 until end of turn."
Currency Converter70%
$0.28↑#2392↓0.284.5 years
"Whenever you discard a card, you may exile that card from your graveyard."