Hedron Crab 
Creature — Crab
$2.88 #1430 0.51 16.9 years
Landfall — Whenever a land you control enters, target player mills three cards. (They put the top three cards of their library into their graveyard.)
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Cards similar to Hedron Crab 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.
Ruin Crab91%
$1.09↓#12810.545.9 years↓
"Whenever a land you control enters, each opponent mills three cards."
Return of the Mole Man82%
$4.69↑#18581↓0.00↓0.2 years↓
"Whenever a land you control enters, you may mill two cards."
Merrow Witsniper81%
$0.26↓#26272↓0.5318.6 years↑
"When this creature enters, target player mills a card."
Cathartic Adept80%
$0.25↓#16403↓0.00↓17.9 years
"
: Target player mills a card."
: Target player mills a card."
Sage of Mysteries80%
$0.22↓#16919↓0.40↓6.6 years↓
"Whenever an enchantment you control enters, target player mills two cards."
Thassa's Devourer80%
$0.07↓#22476↓0.14↓12.3 years↓
"Whenever this creature or another enchantment you control enters, target player mills two cards."
Returned Centaur80%
$0.04↓#21302↓0.11↓12.9 years↓
"When this creature enters, target player mills four cards."
Homarid Explorer80%
$0.08↓#24051↓0.71↑8.4 years↓
"When this creature enters, target player mills four cards."
Sage's Row Denizen79%
$0.08↓#17942↓0.15↓13.6 years↓
"Whenever another blue creature you control enters, target player mills two cards."
Millstone78%
$0.18↓#12280↓0.28↓32.5 years↑
"
, : Target player mills two cards."
, : Target player mills two cards."
Merfolk Mesmerist78%
$0.20↓#24570↓0.33↓15.1 years↓
", : Target player mills two cards."
, : Target player mills two cards."
Vedalken Entrancer78%
$0.12↓#26188↓0.27↓21.0 years↑
", : Target player mills two cards."
, : Target player mills two cards."
Desperate Bloodseeker78%
$0.19↓#14392↓0.00↓2.4 years↓
"When this creature enters, target player mills two cards."
Wall of Lost Thoughts78%
$0.21↓#13972↓0.27↓7.6 years↓
"When this creature enters, target player mills four cards."
Tower of Murmurs78%
$0.35↓#27475↓0.11↓22.9 years↑
"
, : Target player mills eight cards."
, : Target player mills eight cards."
Ambassador Laquatus76%
$1.12↓#18591↓0.22↓24.6 years↑
"
: Target player mills three cards."
: Target player mills three cards."
Jace's Erasure76%
$0.30↓#7719↓0.27↓16.1 years
"Whenever you draw a card, you may have target player mill a card."
Wandering Troubadour76%
$0.16↓#16873↓0.33↓5.1 years↓
"At the beginning of your end step, if you had a land enter the battlefield under your control this turn, venture into the dungeon."
Icecave Crasher76%
$0.09↓#20912↓0.12↓1.1 years↓
"Whenever a land you control enters, this creature gets +1/+0 until end of turn."
Attercop76%
$0.20↓#20819↓0.00↓0.1 years↓
"Whenever a land you control enters, this creature gets +1/+1 until end of turn."