Activated Sleeper 
Creature — Phyrexian Shapeshifter
$1.49 #8605 0.42 4.0 years
Flash
You may have this creature enter as a copy of any creature card in a graveyard that was put there from the battlefield this turn, except it's a Phyrexian in addition to its other types.
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Cards similar to Activated Sleeper 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.
Body Double92%
$0.15↓#6110↑0.06↓19.6 years↑
"You may have this creature enter as a copy of any creature card in a graveyard."
Tobias, Doomed Conqueror78%
$0.08↓#25705↓0.18↓4.0 years
"Flash"
Superior Spider-Man76%
$2.31↑#72470.481.0 years↓
"You may have this card enter as a copy of any creature card in a graveyard, except his name is this card and he's a 4/4 Spider Human Hero in addition to his other types. When you do, exile that card."
The Fourteenth Doctor74%
$112.79↑#14976↓0.93↑2.7 years↓
"You may have this card enter as a copy of a Doctor card in your graveyard that was put there from your library this turn. If you do, it gains haste until end of turn."
Bloodcrazed Paladin74%
$0.33↓#14009↓0.358.9 years↑
"Flash"
Stunt Double72%
$4.07↑#3805↑0.22↓10.0 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Clone72%
$0.31↓#3742↑0.31↓33.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Echoing Deeps72%
$0.57↓#2499↑0.12↓2.8 years↓
"You may have this land enter tapped as a copy of any land card in a graveyard, except it's a Cave in addition to its other types."
Liliana's Standard Bearer72%
$0.21↓#5914↑0.00↓6.2 years↑
"Flash"
Wreck Hunter72%
$0.22↓#18211↓0.00↓3.8 years
"Flash"
Mirror Image70%
$0.30↓#5382↑0.19↓8.1 years↑
"You may have this creature enter as a copy of a creature you control."
Sautekh Immortal70%
$0.35↓#16208↓0.25↓3.9 years
"Flash"
Hollowhenge Overlord70%
$11.28↑#5814↑0.06↓4.8 years
"Flash"
Night Nurse, Healer of Heroes70%
$0.29↓#16073↓0.00↓0.2 years↓
"Flash"
Shadow Kin70%
$0.81↓#78570.474.9 years
"Flash"