Activated Sleeper 
Creature — Phyrexian Shapeshifter
$1.58 #8781 0.17 4.1 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%
$0.16↓#6191↑0.1719.7 years↑
"You may have this creature enter as a copy of any creature card in a graveyard."
Invasion of Amonkhet // Lazotep Convert78%
$0.25↓#85400.05↓3.5 years
"You may have this creature enter as a copy of any creature card in a graveyard, except it's a 4/4 black Zombie in addition to its other colors and types."
Superior Spider-Man75%
$2.15↑#6952↑0.44↑1.1 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%
$109.14↑#15330↓0.40↑2.9 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."
Gerrard's Hourglass Pendant74%
$2.06↑#76170.53↑4.1 years
"Flash"
Bloodcrazed Paladin73%
$0.33↓#14258↓0.139.1 years↑
"Flash"
Clone72%
$0.30↓#3704↑0.37↑33.2 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Stunt Double72%
$4.21↑#3814↑0.38↑10.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Liliana's Standard Bearer72%
$0.23↓#5976↑0.05↓6.3 years↑
"Flash"
Mirror Image71%
$0.30↓#5189↑0.06↓8.3 years↑
"You may have this creature enter as a copy of a creature you control."
Echoing Deeps71%
$0.50↓#2520↑0.182.9 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."
Hollowhenge Overlord70%
$13.98↑#5730↑0.114.9 years
"Flash"