Watcher for Tomorrow 
Creature — Human Wizard
$0.20 #7469 0.29 7.2 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↓#2194↑0.08↓4.5 years↓
"When this creature leaves the battlefield, draw a card."
Papercraft Decoy84%
$0.20#15954↓0.00↓4.5 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%
$1.67↑#14029↓0.00↓27.6 years↑
"When this enchantment leaves the battlefield, you lose 10 life."
Wormfang Newt83%
$0.15↓#23916↓0.2224.3 years↑
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Wormfang Turtle83%
$0.18↓#24161↓0.00↓24.3 years↑
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Wormfang Drake82%
$0.12↓#23561↓0.00↓24.3 years↑
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Worldgorger Dragon82%
$1.53↑#5920↑0.95↑24.3 years↑
"When this creature leaves the battlefield, return the exiled cards to the battlefield under their owners' control."
Skyshroud Behemoth82%
$0.20#30653↓0.2926.6 years↑
"This creature enters tapped."
Undersea Invader82%
$0.07↓#28295↓0.06↓5.6 years↓
"This creature enters tapped."
Forgotten Sentinel82%
$0.05↓#30082↓0.00↓6.2 years↓
"This creature enters tapped."
Custodian of the Trove82%
$0.04↓#27532↓0.00↓11.4 years↑
"This creature enters tapped."
Wolf Cove Villager82%
$0.14↓#28768↓0.00↓0.8 years↓
"This creature enters tapped."
Scarwood Treefolk82%
$0.05↓#30884↓0.00↓19.9 years↑
"This creature enters tapped."
Diregraf Ghoul82%
$0.05↓#16179↓0.00↓14.9 years↑
"This creature enters tapped."
Winter Soldier, Bucky Barnes82%
$0.46↑#27685↓0.00↓0.2 years↓
"this card enters tapped."
Thalakos Seer81%
$0.30↑#14770↓0.04↓28.9 years↑
"When this creature leaves the battlefield, draw a card."
+1 more matching line
Featherbrained Filcher80%
$0.17↓#21519↓0.00↓0.5 years↓
"When this creature leaves the battlefield, create a Food token."
City Pigeon80%
$0.19↓#13325↓0.51↑1.0 years↓
"When this creature leaves the battlefield, create a Food token."
Fear of Abduction80%
$0.17↓#18337↓0.13↓1.9 years↓
"When this creature leaves the battlefield, put each card exiled with it into its owner's hand."
Wormfang Behemoth80%
$0.23↑#30122↓0.00↓24.3 years↑
"When this creature leaves the battlefield, return the exiled cards to their owner's hand."