Currency Converter 
Artifact
Whenever you discard a card, you may exile that card from your graveyard.
{2}, {T}: Draw a card, then discard a card.
{T}: Put a card exiled with this artifact into its owner's graveyard. If it's a land card, create a Treasure token. If it's a nonland card, create a 2/2 black Rogue creature token.
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Cards that do something similar 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.
Conqueror's Galleon // Conqueror's Foothold 100%
$0.76#8371
"{2}, {T}: Draw a card, then discard a card."
+1 more matching line
Collector's Vault 100%
$0.93#1772
"{2}, {T}: Draw a card, then discard a card. Create a Treasure token."
Daily Bugle Newspaper 100%
$0.31#20632
"{2}, {T}: Draw a card, then discard a card. Create a Treasure token."
Containment Construct 99%
$0.25#1877
"Whenever you discard a card, you may exile that card from your graveyard. If you do, you may play that card this turn."
Moonstone, Harsh Mistress 99%
$0.20#14791
"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."
Evie Frye 96%
$0.34#6424
"{1}, {T}: Draw a card, then discard a card. When you discard a creature card this way, target creature you control can't be blocked this turn."
Forbidden Crypt 88%
$1.05#15598
"If a card would be put into your graveyard from anywhere, exile that card instead."
Yawgmoth's Agenda 88%
$0.58#26435
"If a card would be put into your graveyard from anywhere, exile it instead."
Rest in Peace 88%
$0.98#2288
"If a card or token would be put into a graveyard from anywhere, exile it instead."