Ghostly Pilferer 

Creature — Spirit Rogue
$1.73 #1425 0.32 6.3 years
Whenever this creature becomes untapped, you may pay
. If you do, draw a card.
Whenever an opponent casts a spell from anywhere other than their hand, draw a card.
Discard a card: This creature can't be blocked this turn.
Click a line or tag to filter
Cards similar to Ghostly Pilferer 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.
Aerial Extortionist88%
$4.54↑#2778↓0.304.5 years↓
"Whenever another player casts a spell from anywhere other than their hand, draw a card."
Sphinx's Disciple84%
$0.10↓#23549↓0.06↓12.7 years↑
"Whenever this creature becomes untapped, draw a card."
Cephalid Inkshrouder80%
$0.37↓#15817↓0.2724.4 years↑
"Discard a card: This creature gains shroud until end of turn and can't be blocked this turn."
Hermit of the Natterknolls // Lone Wolf of the Natterknolls77%
$0.37↓#12330↓0.14↓10.5 years↑
"Whenever an opponent casts a spell during your turn, draw a card."
Key to the City76%
$0.20↓#13330.21↓10.1 years↑
"Whenever this artifact becomes untapped, you may pay
. If you do, draw a card."
+1 more matching line
Kraum, Ludevic's Opus76%
$2.58↑#7032↓0.259.9 years↑
"Whenever an opponent casts their second spell each turn, draw a card."
Mangara, the Diplomat76%
$0.36↓#610↑0.366.3 years
"Whenever an opponent casts their second spell each turn, draw a card."
Reparations74%
$4.70↑#22801↓0.20↓30.0 years↑
"Whenever an opponent casts a spell that targets you or a creature you control, you may draw a card."
Silverquill Silencer74%
$0.19↓#24660↓0.44↑5.5 years
"Whenever an opponent casts a spell with the chosen name, they lose 3 life and you draw a card."
Insight73%
$1.59↓#11158↓0.2429.0 years↑
"Whenever an opponent casts a green spell, you draw a card."
Well of Discovery72%
$0.41↓#27074↓0.00↓26.4 years↑
"At the beginning of your end step, if you control no untapped lands, draw a card."
Nezahal, Primal Tide72%
$8.43↑#1123↑0.77↑8.8 years↑
"Whenever an opponent casts a noncreature spell, draw a card."
Rhystic Study71%
$67.20↑#46↑2.82↑26.4 years↑
"Whenever an opponent casts a spell, you may draw a card unless that player pays
."
Freyalise's Charm71%
$0.16↓#29946↓0.3531.4 years↑
"Whenever an opponent casts a black spell, you may pay 
. If you do, you draw a card."
Olivia's Dragoon71%
$0.07↓#15655↓0.00↓10.2 years↑
"Discard a card: This creature gains flying until end of turn."
Ephemeron71%
$0.38↓#31620↓0.00↓28.3 years↑
"Discard a card: Return this creature to its owner's hand."
Skywing Aven71%
$0.04↓#29331↓0.14↓24.7 years↑
"Discard a card: Return this creature to its owner's hand."
Aeromoeba71%
$0.09↓#21383↓0.12↓5.3 years
"Discard a card: Switch this creature's power and toughness until end of turn."