Shadow Kin 
Creature — Shapeshifter
$0.69 #8120 0.26 5.1 years
Flash
At the beginning of your upkeep, each player mills three cards. You may exile a creature card from among the cards milled this way. If you do, this creature becomes a copy of that card, except it has this ability.
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Cards similar to Shadow Kin 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.
Shapeshifter's Marrow78%
$0.51↓#26125↓0.07↓19.5 years↑
"At the beginning of each opponent's upkeep, that player reveals the top card of their library. If it's a creature card, the player puts the card into their graveyard and this enchantment becomes a copy of that card."
Cryptoplasm78%
$0.64↓#12938↓0.44↑15.7 years↑
"At the beginning of your upkeep, you may have this creature become a copy of another target creature, except it has this ability."
Mindwrack Harpy78%
$0.22↓#75380.206.7 years↑
"At the beginning of combat on your turn, each player mills three cards."
Malleable Impostor77%
$5.86↑#4600↑0.11↓3.1 years↓
"Flash"
Nimana Skydancer76%
$0.08↓#23251↓0.05↓6.1 years
"Flash"
Worry Beads74%
$0.58↓#23713↓0.1827.0 years↑
"At the beginning of each player's upkeep, that player mills a card."
Mocking Doppelganger74%
$2.79↑#5559↑0.48↑4.4 years
"Flash"
Cemetery Puca73%
$2.76↑#19936↓0.07↓18.5 years↑
"Whenever a creature dies, you may pay 
. If you do, this creature becomes a copy of that creature, except it has this ability."
. If you do, this creature becomes a copy of that creature, except it has this ability."
Sibsig Host72%
$0.09↓#25005↓0.2411.7 years↑
"When this creature enters, each player mills three cards."
Phantom Steed72%
$0.46↓#11640↓0.315.2 years
"Flash"
Ghoulcaller's Bell71%
$0.28↓#65840.2915.1 years↑
"
: Each player mills a card."
: Each player mills a card."
Mirrorweave71%
$1.18↑#13954↓0.40↑18.5 years↑
"Each other creature becomes a copy of target nonlegendary creature until end of turn."