Winter, Cynical Opportunist 
Legendary Creature — Human Warlock
$0.34 #9149 0.27 1.9 years
Deathtouch
Whenever Winter attacks, mill three cards.
Delirium — At the beginning of your end step, you may exile any number of cards from your graveyard with four or more card types among them. If you do, put a permanent card from among them onto the battlefield with a finality counter on it.
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Cards similar to Winter, Cynical Opportunist 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.
Screaming Phantom83%
$0.13↓#22110↓0.00↓2.8 years
"Whenever this creature attacks, mill a card."
Mysterio's Phantasm83%
$0.18↓#17526↓0.291.0 years
"Whenever this creature attacks, mill a card."
World Shaper78%
$5.88↑#1468↑0.40↑8.6 years↑
"Whenever this creature attacks, you may mill three cards."
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$0.22↓#5590↑0.03↓6.6 years↑
"Deathtouch"
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$0.33↓#22045↓0.242.5 years
"Whenever this creature attacks, mill two cards. For each creature card milled this way, create a 1/1 green Saproling creature token."
Obzedat's Aid76%
$0.30↓#17764↓0.47↑13.3 years↑
"Return target permanent card from your graveyard to the battlefield."
Hedge Shredder74%
$2.30↑#1265↑0.38↑1.9 years
"Whenever this Vehicle attacks, you may mill two cards."
+1 more matching line
Patchwork Beastie74%
$0.22↓#12210↓0.12↓1.9 years
"At the beginning of your upkeep, you may mill a card."
Stinging Cave Crawler74%
$0.23↓#11539↓0.302.8 years
"Deathtouch"
Inexorable Blob73%
$0.26↓#15677↓0.3610.4 years↑
"Whenever this creature attacks, if there are four or more card types among cards in your graveyard, create a 3/3 green Ooze creature token that's tapped and attacking."
Flesh Burrower73%
$0.24↓#93160.12↓1.9 years
"Deathtouch"
Teval, the Balanced Scale72%
$4.81↑#2690↑0.60↑1.4 years
"Whenever this card attacks, mill three cards. Then you may return a land card from your graveyard to the battlefield tapped."
Crop Sigil72%
$0.12↓#14143↓0.2010.1 years↑
"At the beginning of your upkeep, you may mill a card."
Nightblade Brigade72%
$0.23↓#101170.12↓1.4 years
"Deathtouch"
Terror of Towashi72%
$0.34#12114↓0.333.4 years↑
"Deathtouch"
Ornery Dilophosaur71%
$0.17↓#18277↓0.45↑6.2 years↑
"Deathtouch"
Colossal Grave-Reaver70%
$10.70↑#1905↑0.52↑1.4 years
"Whenever this creature enters or attacks, mill three cards."
Bloodcurdler70%
$0.32↓#27008↓0.00↓24.9 years↑
"At the beginning of your upkeep, mill a card."
Autumnal Gloom // Ancient of the Equinox70%
$0.13↓#24551↓0.43↑10.4 years↑
"At the beginning of your end step, if there are four or more card types among cards in your graveyard, transform this enchantment."
+1 more matching line
Trystan, Callous Cultivator // Trystan, Penitent Culler70%
$0.33↓#12340↓0.00↓0.6 years↓
"Deathtouch"