Hedron Crab 
Creature — Crab
$2.95 #1398 0.62 17.0 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 Crab90%
$1.09↓#13060.686.1 years↓
"Whenever a land you control enters, each opponent mills three cards."
Return of the Mole Man82%
$4.81↑#17481↓0.39↓0.3 years↓
"Whenever a land you control enters, you may mill two cards."
Merrow Witsniper81%
$0.28↓#26503↓0.18↓18.7 years↑
"When this creature enters, target player mills a card."
Cathartic Adept80%
$0.24↓#16669↓0.00↓18.0 years
"
: Target player mills a card."
: Target player mills a card."
Sage of Mysteries80%
$0.23↓#17386↓0.19↓6.7 years↓
"Whenever an enchantment you control enters, target player mills two cards."
Thassa's Devourer80%
$0.07↓#22895↓0.28↓12.5 years↓
"Whenever this creature or another enchantment you control enters, target player mills two cards."
Returned Centaur80%
$0.05↓#21613↓0.19↓13.1 years↓
"When this creature enters, target player mills four cards."
Homarid Explorer80%
$0.08↓#24305↓0.07↓8.5 years↓
"When this creature enters, target player mills four cards."
Sage's Row Denizen79%
$0.10↓#18306↓0.44↓13.7 years↓
"Whenever another blue creature you control enters, target player mills two cards."
Millstone78%
$0.15↓#12535↓0.07↓32.6 years↑
"
, : Target player mills two cards."
, : Target player mills two cards."
Merfolk Mesmerist78%
$0.15↓#24843↓0.33↓15.3 years↓
", : Target player mills two cards."
, : Target player mills two cards."
Vedalken Entrancer78%
$0.13↓#26441↓0.18↓21.2 years↑
", : Target player mills two cards."
, : Target player mills two cards."
Wall of Lost Thoughts78%
$0.17↓#14226↓0.25↓7.7 years↓
"When this creature enters, target player mills four cards."
Desperate Bloodseeker78%
$0.21↓#14650↓0.05↓2.5 years↓
"When this creature enters, target player mills two cards."
Tower of Murmurs78%
$0.35↓#27730↓0.12↓23.0 years↑
"
, : Target player mills eight cards."
, : Target player mills eight cards."
Ambassador Laquatus76%
$1.17↓#18816↓0.6124.7 years↑
"
: Target player mills three cards."
: Target player mills three cards."
Jace's Erasure76%
$0.26↓#7647↓0.20↓16.3 years
"Whenever you draw a card, you may have target player mill a card."
Wandering Troubadour76%
$0.17↓#17154↓0.00↓5.2 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%
$0.11↓#20954↓0.16↓1.2 years↓
"Whenever a land you control enters, this creature gets +1/+0 until end of turn."
Attercop76%
$0.20↓#16762↓0.10↓0.2 years↓
"Whenever a land you control enters, this creature gets +1/+1 until end of turn."