Stern Lesson {2}{U}
Instant
Draw two cards, then discard a card. Create a tapped Powerstone token. (It's an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.")
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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.
Dihada's Ploy 99%
$0.22#11869
"Draw two cards, then discard a card. You gain life equal to the number of cards you've discarded this turn."
Pulse of the Grid 99%
$0.38#16094
"Draw two cards, then discard a card. Then if an opponent has more cards in hand than you, return this card to its owner's hand."
Probe 94%
$0.09#24787
"Draw three cards, then discard two cards. If this spell was kicked, target player discards two cards."