Stern Lesson 
Instant
$0.17 #10778 0.00 3.9 years
Draw two cards, then discard a card. Create a tapped Powerstone token. (It's an artifact with "
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Cards similar to Stern Lesson 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.
Stone Retrieval Unit86%
$0.13↓#18829↓0.003.9 years
"When this creature enters, create a tapped Powerstone token."
Argothian Opportunist86%
$0.06↓#25524↓0.29↑3.9 years
"When this creature enters, create a tapped Powerstone token."
Koilos Roc85%
$0.05↓#25925↓0.003.9 years
"When this creature enters, create a tapped Powerstone token."
Fallaji Excavation82%
$0.07↓#25769↓0.003.9 years
"Create three tapped Powerstone tokens. You gain 3 life."
Great Desert Prospector82%
$0.17#19000↓0.003.9 years
"When this creature enters, create a tapped Powerstone token for each other creature you control."
Gix's Caress81%
$0.08↓#22275↓0.39↑3.9 years
"Create a tapped Powerstone token."
Catalog78%
$0.07↓#17013↓0.0028.0 years↑
"Draw two cards, then discard a card."
The Brothers' War78%
$1.28↑#124750.15↑3.9 years
"Create two tapped Powerstone tokens."
Splitting the Powerstone78%
$0.11↓#21867↓0.24↑3.9 years
"Create two tapped Powerstone tokens. If the sacrificed artifact was legendary, draw a card."
Excavation Explosion78%
$0.11↓#20446↓0.003.9 years
"this card deals 3 damage to any target. Create a tapped Powerstone token."
Static Net77%
$0.15↓#20729↓0.003.9 years
"When this enchantment enters, you gain 2 life and create a tapped Powerstone token."
Junkyard Genius76%
$0.06↓#21904↓0.003.9 years
"When this creature enters, create a tapped Powerstone token."
Arbalest Engineers75%
$0.21↑#23318↓0.003.9 years
"• Create a tapped Powerstone token."
Urza's Command74%
$0.27↑#97660.12↑3.9 years
"• Create a tapped Powerstone token."
Powerstone Engineer74%
$0.17#26277↓0.063.9 years
"When this creature dies, create a tapped Powerstone token."
Horned Stoneseeker74%
$0.11↓#23426↓0.003.9 years
"When this creature enters, create a tapped Powerstone token."
Thran Spider73%
$0.25↑#105710.003.9 years
"When this creature enters, you and target opponent each create a tapped Powerstone token."
Rousing Read73%
$0.14↓#19624↓0.006.3 years↑
"When this Aura enters, draw two cards, then discard a card."
Snow Day70%
$0.14↓#24656↓0.15↑5.5 years↑
"Draw two cards, then discard a card."
Artificer's Epiphany70%
$0.09↓#14307↓0.0711.3 years↑
"Draw two cards. If you control no artifacts, discard a card."