Vilespawn Spider 

Creature — Spider
$0.16 #16658 0.14 4.9 years
Reach
At the beginning of your upkeep, mill a card. (Put the top card of your library into your graveyard.)
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Cards similar to Vilespawn Spider 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.
Splinterfright80%
$0.25↑#5571↑0.1715.1 years↑
"At the beginning of your upkeep, mill two cards."
+1 more matching line
Tolarian Serpent76%
$1.25↑#28337↓0.2229.4 years↑
"At the beginning of your upkeep, mill seven cards."
Black Widow, Daring Operative75%
$2.96↑#21682↓0.43↑0.3 years↓
"When this card enters, mill three cards."
Morcant's Eyes74%
$0.26↑#9891↑0.090.7 years↓
"

, Sacrifice this enchantment: Create X 2/2 black and green Elf creature tokens, where X is the number of Elf cards in your graveyard. Activate only as a sorcery."
Song of Stupefaction72%
$0.10↓#25167↓0.00↓2.9 years↓
"When this Aura enters, you may mill two cards."
Madame Hydra, Reanimated72%
$0.24↑#22601↓0.29↑0.3 years↓
"Whenever this card enters or attacks, mill two cards."
+1 more matching line
Broodspinner71%
$0.26↑#10692↑0.32↑2.1 years↓
"

,
, Sacrifice this creature: Create a number of 1/1 black and green Insect creature tokens with flying equal to the number of card types among cards in your graveyard."
+1 more matching line
Deathcap Marionette71%
$0.23↑#11226↑0.00↓2.9 years↓
"When this creature enters, you may mill two cards."
Mineshaft Spider71%
$0.18↑#20116↓0.00↓2.9 years↓
"When this creature enters, you may mill two cards."
+1 more matching line
Necromancer's Assistant71%
$0.03↓#23347↓0.00↓12.3 years↑
"When this creature enters, mill three cards."