Billowing Shriekmass 
Creature — Spirit
$0.14 #17781 0.00 1.9 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?
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Void Extrapolator // Omit Variables98%
$0.13↓#27099↓0.010.0 years↓
"This creature gets +1/+1 as long as there are seven or more cards in your graveyard."
+1 more matching line
Springing Tiger97%
$0.10↓#31156↓0.0025.1 years↑
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Anurid Barkripper97%
$0.11↓#27361↓0.0024.4 years↑
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Krosan Beast97%
$5.42↑#192630.11↑25.1 years↑
"This creature gets +7/+7 as long as there are seven or more cards in your graveyard."
Metamorphic Wurm97%
$0.20↑#27357↓0.0025.1 years↑
"This creature gets +4/+4 as long as there are seven or more cards in your graveyard."
Nimble Mongoose96%
$0.09↓#27161↓0.21↑25.1 years↑
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Dark Matter Manipulator93%
$3.74↑#188710.13↑0.0 years↓
"This creature gets +2/+0 for every seven cards in your graveyard."
+1 more matching line
Childhood Horror92%
$0.21↑#29270↓0.0025.1 years↑
"As long as there are seven or more cards in your graveyard, this creature gets +2/+2 and can't block."
+1 more matching line
Frightcrawler92%
$0.10↓#25928↓0.0625.1 years↑
"As long as there are seven or more cards in your graveyard, this creature gets +2/+2 and can't block."
Theorix Metamage // Omit Variables91%
$0.13↓#26599↓0.070.0 years↓
"This creature gets +1/+0 and has flying as long as there are seven or more cards in your graveyard."
+1 more matching line
Mind Drill Assailant90%
$0.11↓#157670.002.2 years
"As long as there are seven or more cards in your graveyard, this creature gets +3/+0."
Bloodcurdler90%
$0.34↑#27316↓0.29↑25.1 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%
$0.11↓#205400.001.9 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%
$0.12↓#28690↓0.56↑24.7 years↑
"This creature gets +1/+1 as long as there are seven or more cards in your graveyard."
Excavation Mole88%
$0.11↓#26255↓0.006.5 years↑
"When this creature enters, mill three cards."
Necromancer's Assistant88%
$0.03↓#23347↓0.0012.3 years↑
"When this creature enters, mill three cards."
Venomous Hierophant88%
$0.09↓#21775↓0.066.7 years↑
"When this creature enters, mill three cards."
Seton's Scout88%
$0.12↓#29914↓0.25↑24.7 years↑
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Mystic Zealot88%
$0.03↓#31352↓0.0725.1 years↑
"As long as there are seven or more cards in your graveyard, this creature gets +1/+1 and has flying."
Mystic Penitent88%
$0.16↑#31086↓0.0025.1 years↑
"As long as there are seven or more cards in your graveyard, this creature gets +1/+1 and has flying."