Shifting Shadow 

Enchantment — Aura
$0.30 #15009 0.07 9.0 years
Enchant creature
Enchanted creature has haste and "At the beginning of your upkeep, destroy this creature. Reveal cards from the top of your library until you reveal a creature card. Put that card onto the battlefield and attach Shifting Shadow to it, then put all other cards revealed this way on the bottom of your library in a random order."
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Cards similar to Shifting Shadow 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.
Mass Polymorph78%
$0.33↑#147330.50↑16.1 years↑
"Exile all creatures you control, then reveal cards from the top of your library until you reveal that many creature cards. Put all creature cards revealed this way onto the battlefield, then shuffle the rest of the revealed cards into your library."
Fireflux Squad77%
$0.35↑#137460.076.4 years↓
"Whenever this creature attacks, you may exile another target attacking creature you control. If you do, reveal cards from the top of your library until you reveal a creature card. Put that card onto the battlefield tapped and attacking and the rest on the bottom of your library in a random order."
Polymorph76%
$1.11↑#8885↑0.50↑29.9 years↑
"Destroy target creature. It can't be regenerated. Its controller reveals cards from the top of their library until they reveal a creature card. The player puts that card onto the battlefield, then shuffles all other cards revealed this way into their library."
Jalira, Master Polymorphist76%
$0.20↓#143500.67↑12.1 years↑
"
,
, Sacrifice another creature: Reveal cards from the top of your library until you reveal a nonlegendary creature card. Put that card onto the battlefield and the rest on the bottom of your library in a random order."
Collision of Realms74%
$0.24↓#160621.25↑4.5 years↓
"Each player shuffles all creatures they own into their library. Each player who shuffled a nontoken creature into their library this way reveals cards from the top of their library until they reveal a creature card, then puts that card onto the battlefield and the rest on the bottom of their library in a random order."
Synthetic Destiny73%
$0.21↓#140120.63↑10.8 years↑
"Exile all creatures you control. At the beginning of the next end step, reveal cards from the top of your library until you reveal that many creature cards, put all creature cards revealed this way onto the battlefield, then shuffle the rest of the revealed cards into your library."
Proteus Staff72%
$0.54↑#9210↑0.32↑22.9 years↑
"
,
: Put target creature on the bottom of its owner's library. That creature's controller reveals cards from the top of their library until they reveal a creature card. The player puts that card onto the battlefield and the rest on the bottom of their library in any order. Activate only as a sorcery."
Transmogrify72%
$0.31↑#11027↑0.066.2 years↓
"Exile target creature. That creature's controller reveals cards from the top of their library until they reveal a creature card. That player puts that card onto the battlefield, then shuffles the rest into their library."
Songbirds' Blessing72%
$0.57↑#3348↑0.39↑3.0 years↓
"Whenever enchanted creature attacks, reveal cards from the top of your library until you reveal an Aura card. You may put that card onto the battlefield. If you don't, put it into your hand. Put the rest on the bottom of your library in a random order."
+1 more matching line
Descendants' Fury70%
$0.28↓#4547↑0.36↑3.1 years↓
"Whenever one or more creatures you control deal combat damage to a player, you may sacrifice one of them. If you do, reveal cards from the top of your library until you reveal a creature card that shares a creature type with the sacrificed creature. Put that card onto the battlefield and the rest on the bottom of your library in a random order."