Thassa's Devourer 
Enchantment Creature — Elemental
$0.07 #22895 0.28 12.5 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%
$0.23↑#17386↑0.196.7 years↓
"Whenever an enchantment you control enters, target player mills two cards."
Scrabbling Skullcrab94%
$0.25↑#11552↑0.11↓2.1 years↓
"Whenever an enchantment you control enters and whenever you fully unlock a Room, target player mills two cards."
Oakheart Dryads84%
$0.09↑#243620.00↓12.5 years
"Whenever this creature or another enchantment you control enters, target creature gets +1/+1 until end of turn."
Merrow Witsniper83%
$0.28↑#265030.18↓18.7 years↑
"When this creature enters, target player mills a card."
Oath of the Ancient Wood82%
$0.23↑#201120.00↓13.3 years
"Whenever this enchantment or another enchantment you control enters, you may put a +1/+1 counter on target creature."
Pious Wayfarer82%
$0.16↑#241530.206.7 years↓
"Whenever an enchantment you control enters, target creature gets +1/+1 until end of turn."
Cathartic Adept81%
$0.24↑#16669↑0.00↓18.0 years↑
"
: Target player mills a card."
: Target player mills a card."
Setessan Skirmisher80%
$0.07#28473↓0.00↓6.7 years↓
"Whenever an enchantment you control enters, this creature gets +1/+1 until end of turn."
Returned Centaur80%
$0.05↓#216130.1913.1 years
"When this creature enters, target player mills four cards."
Homarid Explorer80%
$0.08↑#243050.07↓8.5 years↓
"When this creature enters, target player mills four cards."
Hedron Crab80%
$2.95↑#1398↑0.62↑17.0 years↑
"Whenever a land you control enters, target player mills three cards."
Curse of the Bloody Tome80%
$0.22↑#12919↑0.44↑15.1 years↑
"At the beginning of enchanted player's upkeep, that player mills two cards."
Millstone80%
$0.15↑#12535↑0.07↓32.6 years↑
"
, : Target player mills two cards."
, : Target player mills two cards."
Merfolk Mesmerist79%
$0.15↑#248430.3315.3 years↑
", : Target player mills two cards."
, : Target player mills two cards."
Vedalken Entrancer79%
$0.13↑#264410.18↓21.2 years↑
", : Target player mills two cards."
, : Target player mills two cards."
Desperate Bloodseeker78%
$0.21↑#14650↑0.05↓2.5 years↓
"When this creature enters, target player mills two cards."
Wall of Lost Thoughts78%
$0.17↑#14226↑0.257.7 years↓
"When this creature enters, target player mills four cards."
Rimefur Reindeer78%
$0.14↑#201820.07↓3.1 years↓
"Whenever an enchantment you control enters, tap target creature an opponent controls."
Captivating Unicorn78%
$0.17↑#18292↑0.18↓6.7 years↓
"Whenever an enchantment you control enters, tap target creature an opponent controls."
Nexus Wardens78%
$0.21↑#17171↑0.11↓6.7 years↓
"Whenever an enchantment you control enters, you gain 2 life."