Sleeper's Guile 
Enchantment — Aura
$0.13 #20321 0.86 27.6 years
Enchant creature
Enchanted creature has fear. (It can't be blocked except by artifact creatures and/or black creatures.)
When this Aura is put into a graveyard from the battlefield, return it to its owner's hand.
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Cards similar to Sleeper's Guile 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.
Brilliant Halo95%
$0.23↑#191120.41↓27.9 years
"When this Aura is put into a graveyard from the battlefield, return it to its owner's hand."
Rancor91%
$0.97↑#829↑0.26↓27.6 years
"When this Aura is put into a graveyard from the battlefield, return it to its owner's hand."
Undying Rage90%
$0.04↓#173960.07↓21.0 years↓
"When this Aura is put into a graveyard from the battlefield, return it to its owner's hand."
+1 more matching line
Fear90%
$0.04↓#16097↑0.32↓33.1 years↑
"Enchanted creature has fear."
+1 more matching line
Despondency89%
$0.11↓#200890.19↓27.9 years
"When this Aura is put into a graveyard from the battlefield, return it to its owner's hand."
+1 more matching line
Sleeper's Robe87%
$0.59↑#15516↑0.29↓25.9 years↓
"Enchanted creature has fear."
Brood of Cockroaches86%
$0.17↑#167440.08↓29.6 years↑
"When this creature is put into your graveyard from the battlefield, at the beginning of the next end step, you lose 1 life and return this card to your hand."
Zodiac Dragon86%
$544.00↑#25891↓0.29↓27.3 years
"When this creature is put into your graveyard from the battlefield, you may return it to your hand."
Vineweft84%
$0.06↓#27450↓0.00↓12.1 years↓
"Enchant creature"
Slow Motion84%
$0.19↑#237020.44↓27.6 years
"When this Aura is put into a graveyard from the battlefield, return it to its owner's hand."
+1 more matching line
Immortal Phoenix84%
$0.49↑#186030.26↓7.8 years↓
"When this creature dies, return it to its owner's hand."
Weatherseed Treefolk84%
$1.42↑#231830.00↓27.6 years
"When this creature dies, return it to its owner's hand."
Shivan Phoenix84%
$0.44↑#238030.53↓27.6 years
"When this creature dies, return it to its owner's hand."
Mortus Strider84%
$0.10↓#222910.27↓13.6 years↓
"When this creature dies, return it to its owner's hand."
Endless Cockroaches84%
$0.32↑#12904↑0.22↓29.3 years↑
"When this creature dies, return it to its owner's hand."
Intimidation82%
$0.93↑#15760↑0.31↓26.9 years
"Creatures you control have fear."
Spirit Loop82%
$12.10↑#6683↑0.18↓19.9 years↓
"When this Aura is put into a graveyard from the battlefield, return it to its owner's hand."
Talons of Wildwood82%
$0.12↓#15810↑0.25↓8.1 years↓
"Enchant creature"
Dragon Shadow82%
$0.25↑#15979↑0.00↓23.3 years↓
"Enchanted creature gets +1/+0 and has fear."
+1 more matching line
Spine of Ish Sah82%
$0.26↑#2558↑0.39↓15.6 years↓
"When this artifact is put into a graveyard from the battlefield, return it to its owner's hand."