Billowing Shriekmass 

Creature — Spirit
Flying
When this creature enters, mill three cards. (Put the top three cards of your library into your graveyard.)
Threshold — This creature gets +2/+1 as long as there are seven or more cards in your graveyard.
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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.
Springing Tiger 99%
$0.15#30552
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Nimble Mongoose 99%
$0.06#26419
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Anurid Barkripper 99%
$0.19#26342
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Seton's Scout 99%
$0.23#29076
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Cabal Initiate 92%
$0.21#16500
"This creature gets +1/+2 as long as there are seven or more cards in your graveyard."
Nantuko Calmer 91%
$0.25#27979
"This creature gets +1/+1 as long as there are seven or more cards in your graveyard."
Krosan Beast 90%
$5.05#18711
"This creature gets +7/+7 as long as there are seven or more cards in your graveyard."
Metamorphic Wurm 90%
$0.19#26409
"This creature gets +4/+4 as long as there are seven or more cards in your graveyard."
Werebear 85%
$0.22#8089
"This creature gets +3/+3 as long as there are seven or more cards in your graveyard."
Gnarlwood Dryad 83%
$0.25#8482
"This creature gets +2/+2 as long as there are four or more card types among cards in your graveyard."
Grim Flayer 83%
$0.23#10734
"This creature gets +2/+2 as long as there are four or more card types among cards in your graveyard."