Failed Conversion 
Enchantment — Aura
$0.07 #25834 0.06 3.4 years
Enchant creature
Enchanted creature gets -4/-4.
When enchanted creature dies, surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)
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Cards similar to Failed Conversion 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.
Citywatch Sphinx87%
$0.08↑#288480.067.9 years↑
"When this creature dies, surveil 2."
Mephitic Vapors86%
$0.11↑#20591↑0.36↑7.9 years↑
"All creatures get -1/-1 until end of turn."
+1 more matching line
Exotic Curse84%
$0.12↑#287550.28↑25.9 years↑
"Enchanted creature gets -1/-1 for each basic land type among lands you control."
Ironclaw Curse82%
$0.26↑#31183↓0.45↑30.9 years↑
"Enchanted creature gets -0/-1."
+1 more matching line
Deadly Visit82%
$0.07#238850.007.9 years↑
"Surveil 2."
Miner's Guidewing82%
$0.27↑#11127↑0.002.8 years
"When this creature dies, target creature you control explores."
Death's Approach82%
$0.09↑#211000.38↑13.6 years↑
"Enchanted creature gets -X/-X, where X is the number of creature cards in its controller's graveyard."
+1 more matching line
Chime of Night82%
$0.16↑#211530.0027.2 years↑
"Enchant creature"
Grim Javelineer80%
$0.05↓#266020.23↑1.6 years↓
"Whenever you attack, target attacking creature gets +1/+0 until end of turn. When that creature dies this turn, surveil 1."
Wary Watchdog80%
$0.18↑#15781↑0.091.9 years↓
"When this creature enters or dies, surveil 1."
Lys Alana Informant80%
$0.15↑#15114↑0.000.6 years↓
"When this creature enters or dies, surveil 1."
Wary Thespian80%
$0.03↓#18590↑0.26↑3.4 years
"When this creature enters or dies, surveil 1."
Thawbringer80%
$0.09↑#215410.011.1 years↓
"When this creature enters or dies, surveil 1."
Sinister Starfish80%
$0.18↑#9367↑0.005.2 years↑
"
: Surveil 1."
: Surveil 1."
Clinging Darkness80%
$0.14↑#280780.1320.9 years↑
"Enchanted creature gets -4/-1."
Mire's Grasp80%
$0.14↑#209540.006.6 years↑
"Enchanted creature gets -3/-3."
+1 more matching line
Weight of the Underworld80%
$0.03↓#276250.40↑12.6 years↑
"Enchanted creature gets -3/-2."
Debilitating Injury80%
$0.04↓#266460.27↑11.9 years↑
"Enchanted creature gets -2/-2."
+1 more matching line
Dead Weight80%
$0.05↓#14308↑0.43↑14.9 years↑
"Enchanted creature gets -2/-2."
+1 more matching line
Feebleness80%
$0.10↑#282200.63↑19.9 years↑
"Enchanted creature gets -2/-1."
+1 more matching line