Caustic Crawler 
Creature — Insect
$0.15 #17881 0.10 16.6 years
Landfall — Whenever a land you control enters, you may have target creature get -1/-1 until end of turn.
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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.
Tomb Hex89%
$0.17↑#27076↓0.33↑16.6 years
"If you had a land enter the battlefield under your control this turn, that creature gets -4/-4 until end of turn instead."
Orc Sureshot88%
$0.20↑#165300.29↑11.6 years↓
"Whenever another creature you control enters, target creature an opponent controls gets -1/-1 until end of turn."
Weed-Pruner Poplar87%
$0.15#26274↓0.29↑18.6 years↑
"At the beginning of your upkeep, target creature other than this creature gets -1/-1 until end of turn."
Death Match85%
$0.62↑#23211↓0.94↑23.9 years↑
"Whenever a creature enters, that creature's controller may have target creature of their choice get -3/-3 until end of turn."
Grandmother Sengir83%
$1.09↑#29343↓0.27↑30.9 years↑
"
, 
: Target creature gets -1/-1 until end of turn."
, : Target creature gets -1/-1 until end of turn."
Hagra Sharpshooter81%
$0.05↓#29873↓0.00↓10.9 years↓
"
: Target creature gets -1/-1 until end of turn."
: Target creature gets -1/-1 until end of turn."
Smokespew Invoker81%
$0.14↓#30873↓0.47↑23.6 years↑
"
: Target creature gets -3/-3 until end of turn."
: Target creature gets -3/-3 until end of turn."
Fourth Bridge Prowler80%
$0.21↑#145120.00↓9.6 years↓
"When this creature enters, you may have target creature get -1/-1 until end of turn."
Disciple of Tevesh Szat80%
$0.11↓#29488↓0.28↑20.1 years↑
": Target creature gets -1/-1 until end of turn."
: Target creature gets -1/-1 until end of turn."
Turntimber Basilisk79%
$0.25↑#156670.65↑16.9 years
"Whenever a land you control enters, you may have target creature block this creature this turn if able."
Blister Beetle78%
$0.05↓#24629↓0.29↑17.9 years↑
"When this creature enters, target creature gets -1/-1 until end of turn."
Farbog Boneflinger78%
$0.06↓#30716↓0.29↑14.6 years↓
"When this creature enters, target creature gets -2/-2 until end of turn."
Makindi Ox78%
$0.11↓#186240.065.9 years↓
"Whenever a land you control enters, tap target creature an opponent controls."
Eyeblight Assassin77%
$0.07↓#21888↓0.31↑11.1 years↓
"When this creature enters, target creature an opponent controls gets -1/-1 until end of turn."
Adventuring Gear77%
$0.24↑#6565↑0.00↓16.9 years
"Whenever a land you control enters, equipped creature gets +2/+2 until end of turn."
Keening Banshee76%
$0.12↓#27308↓0.00↓21.0 years↑
"When this creature enters, target creature gets -2/-2 until end of turn."
Cabal Torturer76%
$0.08↓#27420↓0.20↑24.6 years↑
", : Target creature gets -1/-1 until end of turn."
, : Target creature gets -1/-1 until end of turn."
Scorpion's Sting76%
$0.15#14090↑0.22↑1.0 years↓
"Target creature gets -3/-3 until end of turn."
Cosi's Ravager76%
$0.14↓#170610.29↑16.6 years
"Whenever a land you control enters, you may have this creature deal 1 damage to target player or planeswalker."
Plague Witch76%
$0.15#25095↓0.00↓26.6 years↑
", , Discard a card: Target creature gets -1/-1 until end of turn."
, , Discard a card: Target creature gets -1/-1 until end of turn."