Deep-Sea Terror 
Creature — Serpent
$0.19 #27754 0.44 11.1 years
This creature can't attack unless there are seven or more cards in your graveyard.
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Cards similar to Deep-Sea Terror 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.
Krosan Beast86%
$5.27↑#18991↑0.00↓24.9 years↑
"This creature gets +7/+7 as long as there are seven or more cards in your graveyard."
Nimble Mongoose86%
$0.07↓#267180.00↓24.9 years↑
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Anurid Barkripper86%
$0.12↓#270290.4124.3 years↑
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Springing Tiger86%
$0.12↓#308800.00↓24.9 years↑
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Metamorphic Wurm86%
$0.19#268390.25↓24.9 years↑
"This creature gets +4/+4 as long as there are seven or more cards in your graveyard."
River Serpent85%
$0.15↓#18943↑0.18↓9.4 years↓
"This creature can't attack unless there are five or more cards in your graveyard."
Childhood Horror84%
$0.17↓#289750.22↓24.9 years↑
"As long as there are seven or more cards in your graveyard, this creature gets +2/+2 and can't block."
Frightcrawler84%
$0.17↓#256220.00↓24.9 years↑
"As long as there are seven or more cards in your graveyard, this creature gets +2/+2 and can't block."
Bonded Construct82%
$0.04↓#226230.29↓11.1 years
"This creature can't attack alone."
Raging Kronch82%
$0.04↓#301330.00↓7.3 years↓
"This creature can't attack alone."
Trusty Companion82%
$0.12↓#310750.29↓9.9 years↓
"This creature can't attack alone."
Billowing Shriekmass81%
$0.18↓#17762↑0.08↓1.8 years↓
"This creature gets +2/+1 as long as there are seven or more cards in your graveyard."
Crypt Feaster80%
$0.08↓#20359↑0.05↓1.8 years↓
"Whenever this creature attacks, if there are seven or more cards in your graveyard, this creature gets +2/+0 until end of turn."
Giant Turtle80%
$0.43↑#273850.00↓32.3 years↑
"This creature can't attack if it attacked during your last turn."
Mystic Visionary79%
$0.06↓#318260.29↓24.9 years↑
"This creature has flying as long as there are seven or more cards in your graveyard."
Vantress Gargoyle78%
$0.24↑#11509↑0.77↑6.9 years↓
"This creature can't attack unless defending player has seven or more cards in their graveyard."
Phyrexian Marauder78%
$3.38↑#16527↑0.05↓29.6 years↑
"This creature can't attack unless you pay 
for each +1/+1 counter on it."
for each +1/+1 counter on it."
Treacherous Werewolf78%
$0.12↓#312720.00↓24.3 years↑
"As long as there are seven or more cards in your graveyard, this creature gets +2/+2 and has "When this creature dies, you lose 4 life.""
Nantuko Calmer77%
$0.24↑#282540.62↑24.6 years↑
"This creature gets +1/+1 as long as there are seven or more cards in your graveyard."
Cephalid Inkmage76%
$0.14↓#15710↑0.28↓1.8 years↓
"This creature can't be blocked as long as there are seven or more cards in your graveyard."