Vilespawn Spider 

Creature — Spider
Reach
At the beginning of your upkeep, mill a card. (Put the top card of your library into your graveyard.)
{2}{G}{U}, {T}, Sacrifice this creature: Create a 1/1 green Insect creature token for each creature card in your graveyard. Activate only as a sorcery.
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Cards that do something similar 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.
Egon, God of Death // Throne of Death 100%
$0.38#11002
"At the beginning of your upkeep, mill a card."
Deathbonnet Sprout // Deathbonnet Hulk 92%
$0.13#14865
"At the beginning of your upkeep, mill a card. Then if there are three or more creature cards in your graveyard, transform this creature."