Undead Butler 
Creature — Zombie
$0.27 #4240 0.06 4.9 years
When this creature enters, mill three cards. (Put the top three cards of your library into your graveyard.)
When this creature dies, you may exile it. When you do, return target creature card from your graveyard to your hand.
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Cards similar to Undead Butler 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.
Doombot Harbinger100%
$0.37↑#18216↓0.100.3 years↓
"When this creature dies, you may exile this card. When you do, return target creature card from your graveyard to your hand."
+1 more matching line
Sylvan Hierophant92%
$0.29↑#29578↓0.0629.4 years↑
"When this creature dies, exile it, then return another target creature card from your graveyard to your hand."
Dutiful Attendant85%
$0.15↓#15290↓0.0011.6 years↑
"When this creature dies, return another target creature card from your graveyard to your hand."
Carrion Thrash84%
$0.18↓#29164↓0.1218.0 years↑
"When this creature dies, you may pay 
. If you do, return another target creature card from your graveyard to your hand."
. If you do, return another target creature card from your graveyard to your hand."
Paramecia Coloniex82%
$0.27#17822↓0.130.6 years↓
"When this creature dies, you may exile it. When you do, put target creature card from your graveyard on top of your library."
+1 more matching line
Excavation Mole82%
$0.11↓#26255↓0.006.5 years↑
"When this creature enters, mill three cards."
Necromancer's Assistant82%
$0.03↓#23347↓0.0012.3 years↑
"When this creature enters, mill three cards."
Venomous Hierophant82%
$0.09↓#21775↓0.066.7 years↑
"When this creature enters, mill three cards."
Eerie Soultender81%
$0.08↓#17809↓0.104.1 years
"
, Exile this card from your graveyard: Return another target creature card from your graveyard to your hand."
, Exile this card from your graveyard: Return another target creature card from your graveyard to your hand."+1 more matching line
Venomized Cat80%
$0.16↓#12946↓0.001.1 years↓
"When this creature enters, mill two cards."
Screeching Skaab80%
$0.05↓#23833↓0.21↑14.7 years↑
"When this creature enters, mill two cards."
Sultai Skullkeeper80%
$0.03↓#28404↓0.1111.7 years↑
"When this creature enters, mill two cards."
Wailing Ghoul80%
$0.10↓#19844↓0.0010.2 years↑
"When this creature enters, mill two cards."
Armored Skaab80%
$0.42↑#22067↓0.0015.1 years↑
"When this creature enters, mill four cards."
Laboratory Brute80%
$0.05↓#26607↓0.24↑10.2 years↑
"When this creature enters, mill four cards."
Deathcap Marionette80%
$0.23↓#11226↓0.002.9 years↓
"When this creature enters, you may mill two cards."
Mineshaft Spider80%
$0.18↓#20116↓0.002.9 years↓
"When this creature enters, you may mill two cards."
Exhumer Thrull80%
$0.13↓#28824↓0.0720.7 years↑
"When this creature enters or the creature it haunts dies, return target creature card from your graveyard to your hand."
Kraven's Last Hunt79%
$0.29↑#15222↓0.31↑1.1 years↓
"Return target creature card from your graveyard to your hand."
Greenwarden of Murasa78%
$0.26↓#37500.1211.0 years↑
"When this creature dies, you may exile it. If you do, return target card from your graveyard to your hand."