Ruin Crab 
Creature — Crab
$1.09 #1281 0.54 5.9 years
Landfall — Whenever a land you control enters, each opponent mills three cards. (To mill a card, a player puts the top card of their library into their graveyard.)
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Cards similar to Ruin 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.
Hedron Crab91%
$2.88↑#14300.5116.9 years↑
"Whenever a land you control enters, target player 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."
Elfsworn Giant80%
$0.30↓#4947↓0.18↓1.8 years↓
"Whenever a land you control enters, create a 1/1 green Elf Warrior creature token."
Sporemound80%
$0.15↓#3568↓0.10↓13.1 years↑
"Whenever a land you control enters, create a 1/1 green Saproling creature token."
Zendikar's Roil80%
$0.76↓#2104↓0.26↓11.1 years↑
"Whenever a land you control enters, create a 2/2 green Elemental creature token."
Rampaging Baloths79%
$0.23↓#376↑0.44↓16.9 years↑
"Whenever a land you control enters, create a 4/4 green Beast creature token."
Wandering Troubadour79%
$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."
Tunneling Geopede78%
$0.29↓#4909↓0.14↓10.9 years↑
"Whenever a land you control enters, this creature deals 1 damage to each opponent."
Sabotender78%
$0.26↓#2426↓0.32↓1.2 years↓
"Whenever a land you control enters, this creature deals 1 damage to each opponent."
Spitfire Lagac78%
$0.20↓#3917↓0.15↓5.9 years
"Whenever a land you control enters, this creature deals 1 damage to each opponent."
Sphinx Mindbreaker78%
$1.68↑#15806↓0.20↓6.6 years
"When this creature enters, each opponent mills ten cards."
Grazing Gladehart78%
$0.11↓#10667↓0.29↓16.9 years↑
"Whenever a land you control enters, you may gain 2 life."
Kazandu Nectarpot78%
$0.15↓#6520↓0.00↓5.9 years
"Whenever a land you control enters, you gain 1 life."
Eumidian Terrabotanist78%
$0.29↓#6950↓0.20↓1.1 years↓
"Whenever a land you control enters, you gain 1 life."
Icecave Crasher78%
$0.09↓#20912↓0.12↓1.1 years↓
"Whenever a land you control enters, this creature gets +1/+0 until end of turn."
Attercop78%
$0.20↓#20819↓0.00↓0.1 years↓
"Whenever a land you control enters, this creature gets +1/+1 until end of turn."
Hedron Scrabbler78%
$0.05↓#24307↓0.5816.9 years↑
"Whenever a land you control enters, this creature gets +1/+1 until end of turn."
Scythe Leopard78%
$0.08↓#20224↓0.10↓10.9 years↑
"Whenever a land you control enters, this creature gets +1/+1 until end of turn."
Makindi Sliderunner78%
$0.15↓#24446↓0.5310.9 years↑
"Whenever a land you control enters, this creature gets +1/+1 until end of turn."