Undead Butler 
Creature — Zombie
$0.28 #4336 0.03 4.8 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%
$0.26↓#19068↓0.000.2 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
Eerie Soultender92%
$0.10↓#17436↓0.27↑4.0 years
"When this creature enters, mill three cards."
+1 more matching line
Sylvan Hierophant92%
$0.29↑#29166↓0.0829.2 years↑
"When this creature dies, exile it, then return another target creature card from your graveyard to your hand."
Dutiful Attendant84%
$0.22↓#14994↓0.0011.4 years↑
"When this creature dies, return another target creature card from your graveyard to your hand."
Carrion Thrash84%
$0.16↓#28874↓0.19↑17.9 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%
$0.24↓#18493↓0.000.5 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%
$0.14↓#25898↓0.19↑6.4 years↑
"When this creature enters, mill three cards."
Venomous Hierophant82%
$0.09↓#21461↓0.006.6 years↑
"When this creature enters, mill three cards."
Necromancer's Assistant82%
$0.07↓#23075↓0.0012.1 years↑
"When this creature enters, mill three cards."
Sultai Skullkeeper80%
$0.03↓#28178↓0.43↑11.6 years↑
"When this creature enters, mill two cards."
Venomized Cat80%
$0.20↓#13051↓0.30↑1.0 years↓
"When this creature enters, mill two cards."
Screeching Skaab80%
$0.03↓#23628↓0.13↑14.6 years↑
"When this creature enters, mill two cards."
Wailing Ghoul80%
$0.12↓#19699↓0.0910.1 years↑
"When this creature enters, mill two cards."
Armored Skaab80%
$0.40↑#22013↓0.25↑14.9 years↑
"When this creature enters, mill four cards."
Laboratory Brute80%
$0.04↓#26314↓0.20↑10.1 years↑
"When this creature enters, mill four cards."
Kraven's Last Hunt80%
$0.24↓#15227↓0.21↑1.0 years↓
"Return target creature card from your graveyard to your hand."
Mineshaft Spider80%
$0.21↓#19625↓0.27↑2.8 years↓
"When this creature enters, you may mill two cards."
Deathcap Marionette80%
$0.16↓#10955↓0.002.8 years↓
"When this creature enters, you may mill two cards."
Iname, Life Aspect80%
$0.90↑#20451↓0.23↑21.9 years↑
"When this card dies, you may exile it. If you do, return any number of target Spirit cards from your graveyard to your hand."
Exhumer Thrull80%
$0.11↓#28540↓0.24↑20.6 years↑
"When this creature enters or the creature it haunts dies, return target creature card from your graveyard to your hand."