Thassa's Devourer 
Enchantment Creature — Elemental
$0.07 #22476 0.14 12.3 years
Constellation — Whenever this creature or another enchantment you control enters, target player mills two cards.
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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.
Sage of Mysteries99%
$0.22↑#16919↑0.40↑6.6 years↓
"Whenever an enchantment you control enters, target player mills two cards."
Scrabbling Skullcrab94%
$0.27↑#11246↑0.111.9 years↓
"Whenever an enchantment you control enters and whenever you fully unlock a Room, target player mills two cards."
Merrow Witsniper84%
$0.26↑#262720.53↑18.6 years↑
"When this creature enters, target player mills a card."
Oakheart Dryads84%
$0.09↑#239580.2012.3 years
"Whenever this creature or another enchantment you control enters, target creature gets +1/+1 until end of turn."
Oath of the Ancient Wood82%
$0.23↑#196820.0713.1 years
"Whenever this enchantment or another enchantment you control enters, you may put a +1/+1 counter on target creature."
Pious Wayfarer82%
$0.18↑#238560.136.6 years↓
"Whenever an enchantment you control enters, target creature gets +1/+1 until end of turn."
Cathartic Adept81%
$0.25↑#16403↑0.00↓17.9 years↑
"
: Target player mills a card."
: Target player mills a card."
Returned Centaur80%
$0.04↓#213020.1112.9 years
"When this creature enters, target player mills four cards."
Homarid Explorer80%
$0.08↑#240510.71↑8.4 years↓
"When this creature enters, target player mills four cards."
Setessan Skirmisher80%
$0.08↑#28021↓0.00↓6.6 years↓
"Whenever an enchantment you control enters, this creature gets +1/+1 until end of turn."
Curse of the Bloody Tome80%
$0.23↑#12750↑0.0914.9 years↑
"At the beginning of enchanted player's upkeep, that player mills two cards."
Hedron Crab80%
$2.88↑#1430↑0.51↑16.9 years↑
"Whenever a land you control enters, target player mills three cards."
Millstone80%
$0.18↑#12280↑0.28↑32.5 years↑
"
, : Target player mills two cards."
, : Target player mills two cards."
Merfolk Mesmerist79%
$0.20↑#245700.33↑15.1 years↑
", : Target player mills two cards."
, : Target player mills two cards."
Vedalken Entrancer79%
$0.12↑#261880.27↑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."
Rimefur Reindeer78%
$0.14↑#197220.80↑3.0 years↓
"Whenever an enchantment you control enters, tap target creature an opponent controls."
Captivating Unicorn78%
$0.17↑#181100.25↑6.6 years↓
"Whenever an enchantment you control enters, tap target creature an opponent controls."
Nexus Wardens77%
$0.19↑#16902↑0.47↑6.6 years↓
"Whenever an enchantment you control enters, you gain 2 life."