Watcher for Tomorrow 
Creature — Human Wizard
$0.18 #7578 0.06 7.4 years
Hideaway 4 (When this creature enters, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.)
This creature enters tapped.
When this creature leaves the battlefield, put the exiled card into its owner's hand.
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Cards similar to Watcher for Tomorrow 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.
Circuit Mender84%
$0.17↓#2274↑0.054.7 years↓
"When this creature leaves the battlefield, draw a card."
Papercraft Decoy84%
$0.21↑#16411↓0.004.7 years↓
"When this creature leaves the battlefield, you may pay 
. If you do, draw a card."
. If you do, draw a card."
Delusions of Mediocrity84%
$1.69↑#14181↓0.1327.7 years↑
"When this enchantment leaves the battlefield, you lose 10 life."
Wormfang Turtle83%
$0.18#24151↓0.1124.4 years↑
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Wormfang Newt83%
$0.17↓#23786↓0.0024.4 years↑
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Wormfang Drake82%
$0.13↓#23898↓0.0524.4 years↑
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Worldgorger Dragon82%
$1.41↑#6040↑0.61↑24.4 years↑
"When this creature leaves the battlefield, return the exiled cards to the battlefield under their owners' control."
Diregraf Ghoul82%
$0.06↓#16265↓0.0515.1 years↑
"This creature enters tapped."
Wolf Cove Villager82%
$0.15↓#28872↓0.050.9 years↓
"This creature enters tapped."
Shambling Ghoul82%
$0.05↓#28695↓0.1211.3 years↑
"This creature enters tapped."
Custodian of the Trove82%
$0.04↓#27650↓0.0011.6 years↑
"This creature enters tapped."
Undersea Invader82%
$0.11↓#28638↓0.31↑5.7 years↓
"This creature enters tapped."
Crooked Custodian82%
$0.02↓#28979↓0.38↑4.5 years↓
"This creature enters tapped."
Forgotten Sentinel82%
$0.04↓#30338↓0.006.3 years↓
"This creature enters tapped."
Scarwood Treefolk82%
$0.07↓#31237↓0.0020.0 years↑
"This creature enters tapped."
Skyshroud Behemoth82%
$0.28↑#30893↓0.21↑26.7 years↑
"This creature enters tapped."
Winter Soldier, Bucky Barnes82%
$0.20↑#27303↓0.25↑0.3 years↓
"this card enters tapped."
Thalakos Seer81%
$0.33↑#14897↓0.1429.0 years↑
"When this creature leaves the battlefield, draw a card."
+1 more matching line
Featherbrained Filcher80%
$0.11↓#21172↓0.18↑0.6 years↓
"When this creature leaves the battlefield, create a Food token."
City Pigeon80%
$0.17↓#13174↓0.071.1 years↓
"When this creature leaves the battlefield, create a Food token."