Stinging Study 
Instant
$10.78 #3366 0.24 5.4 years
You draw X cards and you lose X life, where X is the mana value of a commander you own on the battlefield or in the command zone.
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Cards similar to Stinging Study 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.
Skeletal Scrying84%
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"You draw X cards and you lose X life."
Ancient Craving83%
$0.28↓#5856↓0.06↓28.2 years↑
"You draw three cards and you lose 3 life."
Ambition's Cost83%
$0.12↓#36540.09↓27.3 years↑
"You draw three cards and you lose 3 life."
Ad Nauseam82%
$10.62↓#1328↑1.78↑17.9 years↑
"Reveal the top card of your library and put that card into your hand. You lose life equal to its mana value. You may repeat this process any number of times."
Minions' Murmurs81%
$0.25↓#15272↓0.11↓19.3 years↑
"You draw X cards and you lose X life, where X is the number of creatures you control."
Succumb to Temptation80%
$0.07↓#11181↓0.05↓10.1 years↑
"You draw two cards and you lose 2 life."
Night's Whisper80%
$0.29↓#182↑0.08↓22.3 years↑
"You draw two cards and lose 2 life."
Necrologia80%
$0.35↓#9418↓0.3328.2 years↑
"Draw X cards."
One with the Machine78%
$0.22↓#28600.278.1 years↑
"Draw cards equal to the greatest mana value among artifacts you control."
Parting Thoughts76%
$0.25↓#20623↓0.00↓9.8 years↑
"Destroy target creature. You draw X cards and you lose X life, where X is the number of counters on that creature."
Cut of the Profits76%
$0.27↓#11705↓0.244.4 years↓
"You draw X cards and you lose X life."
Damnable Pact76%
$0.59↓#31580.1911.4 years↑
"Target player draws X cards and loses X life."
Sanguimancy76%
$0.21↓#19707↓0.2212.6 years↑
"You draw X cards and you lose X life, where X is your devotion to black."
Imposing Grandeur74%
$1.78↓#6615↓0.41↑4.8 years
"Each player may discard their hand and draw cards equal to the greatest mana value of a commander they own on the battlefield or in the command zone."
Eventide's Shadow74%
$0.20↓#7751↓0.00↓0.6 years↓
"Remove any number of counters from among permanents on the battlefield. You draw cards and lose life equal to the number of counters removed this way."
Painful Truths74%
$0.27↓#1703↑0.10↓10.9 years↑
"You draw X cards and lose X life, where X is the number of colors of mana spent to cast this spell."
Phyrexian Gargantua74%
$0.06↓#15612↓0.00↓25.3 years↑
"When this creature enters, you draw two cards and you lose 2 life."
Promise of Power73%
$0.49↓#12664↓0.00↓22.9 years↑
"• You draw five cards and you lose 5 life."
Rush of Knowledge72%
$0.17↓#9291↓0.05↓23.3 years↑
"Draw cards equal to the greatest mana value among permanents you control."
Feed the Infection72%
$0.32↓#10460↓0.42↑3.6 years↓
"You draw three cards and you lose 3 life."