Billowing Shriekmass 
Creature — Spirit
$0.18 #17762 0.08 1.8 years
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 similar to Billowing Shriekmass 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.
Nimble Mongoose97%
$0.07↓#26718↓0.0024.9 years↑
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Anurid Barkripper97%
$0.12↓#27029↓0.41↑24.3 years↑
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Springing Tiger97%
$0.12↓#30880↓0.0024.9 years↑
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Krosan Beast97%
$5.27↑#189910.0024.9 years↑
"This creature gets +7/+7 as long as there are seven or more cards in your graveyard."
Metamorphic Wurm97%
$0.19↑#26839↓0.25↑24.9 years↑
"This creature gets +4/+4 as long as there are seven or more cards in your graveyard."
Mind Drill Assailant93%
$0.13↓#151710.35↑2.1 years
"As long as there are seven or more cards in your graveyard, this creature gets +3/+0."
Childhood Horror92%
$0.17↓#28975↓0.22↑24.9 years↑
"As long as there are seven or more cards in your graveyard, this creature gets +2/+2 and can't block."
Frightcrawler92%
$0.17↓#25622↓0.0024.9 years↑
"As long as there are seven or more cards in your graveyard, this creature gets +2/+2 and can't block."
Bloodcurdler90%
$0.32↑#27008↓0.0024.9 years↑
"As long as there are seven or more cards in your graveyard, this creature gets +1/+1 and has "At the beginning of your end step, exile two cards from your graveyard.""
+1 more matching line
Crypt Feaster90%
$0.08↓#203590.051.8 years
"Whenever this creature attacks, if there are seven or more cards in your graveyard, this creature gets +2/+0 until end of turn."
Nantuko Calmer89%
$0.24↑#28254↓0.62↑24.6 years↑
"This creature gets +1/+1 as long as there are seven or more cards in your graveyard."
Excavation Mole88%
$0.14↓#25898↓0.19↑6.4 years↑
"When this creature enters, mill three cards."
Venomous Hierophant88%
$0.09↓#21461↓0.006.6 years↑
"When this creature enters, mill three cards."
Necromancer's Assistant88%
$0.07↓#23075↓0.0012.1 years↑
"When this creature enters, mill three cards."
Seton's Scout88%
$0.11↓#29596↓0.1424.6 years↑
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Mystic Penitent88%
$0.17↓#30911↓0.24↑24.9 years↑
"As long as there are seven or more cards in your graveyard, this creature gets +1/+1 and has flying."
Mystic Zealot88%
$0.04↓#31134↓0.20↑24.9 years↑
"As long as there are seven or more cards in your graveyard, this creature gets +1/+1 and has flying."
Nightwhorl Hermit88%
$0.13↓#148020.27↑2.1 years
"As long as there are seven or more cards in your graveyard, this creature gets +1/+0 and can't be blocked."
Chlorophant88%
$0.50↑#27900↓0.0024.9 years↑
"As long as there are seven or more cards in your graveyard, this creature has "At the beginning of your upkeep, you may put another +1/+1 counter on this creature.""
Sultai Skullkeeper88%
$0.03↓#28178↓0.43↑11.6 years↑
"When this creature enters, mill two cards."