Iceberg Cancrix 
Snow Creature — Crab
$0.27 #12751 0.28 7.4 years
Whenever another snow permanent you control enters, you may have target player mill two cards.
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Cards similar to Iceberg Cancrix 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.
Altar of the Brood82%
$10.32↑#1422↑0.83↑12.1 years↑
"Whenever another permanent you control enters, each opponent mills a card."
Isu the Abominable79%
$3.38↑#18118↓0.00↓3.9 years↓
"Whenever another snow permanent you control enters, you may pay 
, 
, or . If you do, put a +1/+1 counter on Isu."
, , or . If you do, put a +1/+1 counter on Isu."
Marit Lage's Slumber77%
$0.52↑#8870↑0.297.4 years
"Whenever this card or another snow permanent you control enters, scry 1."
Hedron Crab74%
$2.95↑#1398↑0.62↑17.0 years↑
"Whenever a land you control enters, target player mills three cards."
Sage of Mysteries70%
$0.23↓#17386↓0.196.7 years
"Whenever an enchantment you control enters, target player mills two cards."
Sage's Row Denizen70%
$0.10↓#18306↓0.44↑13.7 years↑
"Whenever another blue creature you control enters, target player mills two cards."
Thassa's Devourer70%
$0.07↓#22895↓0.2812.5 years↑
"Whenever this creature or another enchantment you control enters, target player mills two cards."
Jace's Erasure70%
$0.26↓#7647↑0.2016.3 years↑
"Whenever you draw a card, you may have target player mill a card."