Sewer Nemesis 
Creature — Horror
$0.91 #5977 0.33 15.2 years
As this creature enters, choose a player.
Sewer Nemesis's power and toughness are each equal to the number of cards in the chosen player's graveyard.
Whenever the chosen player casts a spell, that player mills a card.
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Cards similar to Sewer Nemesis 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.
Lord of Extinction94%
$0.69↓#3690↑0.2617.3 years↑
"this card's power and toughness are each equal to the number of cards in all graveyards."
Consuming Aberration91%
$0.20↓#1606↑0.58↑13.6 years↓
"this card's power and toughness are each equal to the number of cards in your opponents' graveyards."
+1 more matching line
Haunting Apparition90%
$0.14↓#31622↓0.00↓29.9 years↑
"As this creature enters, choose an opponent."
+1 more matching line
Splinterfright88%
$0.29↓#53690.2414.9 years
"this card's power and toughness are each equal to the number of creature cards in your graveyard."
+1 more matching line
Boneyard Wurm87%
$0.13↓#13981↓0.2914.9 years
"this card's power and toughness are each equal to the number of creature cards in your graveyard."
Revenant86%
$0.06↓#19255↓0.2528.6 years↑
"this card's power and toughness are each equal to the number of creature cards in your graveyard."
Cognivore86%
$0.46↓#27786↓0.21↓24.9 years↑
"this card's power and toughness are each equal to the number of instant cards in all graveyards."
Old Stickfingers86%
$0.29↓#3986↑0.18↓4.9 years↓
"this card's power and toughness are each equal to the number of creature cards in your graveyard."
Apocalypse Demon84%
$0.27↓#15704↓0.53↑9.1 years↓
"this card's power and toughness are each equal to the number of cards in your graveyard."
Consuming Blob84%
$0.39↓#12702↓0.55↑4.9 years↓
"this card's power is equal to the number of card types among cards in your graveyard and its toughness is equal to that number plus 1."
Cantivore84%
$0.60↓#29461↓0.2424.9 years↑
"this card's power and toughness are each equal to the number of enchantment cards in all graveyards."
Boneyard Mycodrax83%
$0.30↓#15271↓0.05↓6.4 years↓
"this card's power and toughness are each equal to the number of other creature cards in your graveyard."
Magnivore83%
$0.87↓#17369↓0.2524.9 years↑
"this card's power and toughness are each equal to the number of sorcery cards in all graveyards."
Lhurgoyf82%
$0.28↓#8228↓0.83↑31.3 years↑
"this card's power is equal to the number of creature cards in all graveyards and its toughness is equal to that number plus 1."
Slag Fiend82%
$0.20↓#25471↓0.00↓15.3 years
"this card's power and toughness are each equal to the number of artifact cards in all graveyards."
Umbra Stalker82%
$0.45↓#26501↓0.2718.1 years↑
"this card's power and toughness are each equal to the number of black mana symbols in the mana costs of cards in your graveyard."
Mortivore81%
$0.32↓#54790.14↓24.9 years↑
"this card's power and toughness are each equal to the number of creature cards in all graveyards."
Nightstalker Engine80%
$0.74↓#31248↓0.3528.2 years↑
"this card's power is equal to the number of creature cards in your graveyard."
Entropic Specter80%
$0.43↓#27167↓0.81↑28.2 years↑
"As this creature enters, choose an opponent."
+1 more matching line
Urborg Lhurgoyf80%
$0.28↓#14775↓0.07↓4.0 years↓
"this card's power is equal to the number of creature cards in your graveyard and its toughness is equal to that number plus 1."