Deceiver of Form 
Creature — Eldrazi
$0.45 #10016 1.00 10.6 years
( represents colorless mana.)
represents colorless mana.)At the beginning of combat on your turn, reveal the top card of your library. If a creature card is revealed this way, you may have creatures you control other than this creature become copies of that card until end of turn. You may put that card on the bottom of your library.
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Cards similar to Deceiver of Form 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.
Cryptoplasm82%
$0.63↑#12679↓0.07↓15.6 years↑
"At the beginning of your upkeep, you may have this creature become a copy of another target creature, except it has this ability."
Deepfathom Echo74%
$0.33↓#97120.12↓2.8 years↓
"At the beginning of combat on your turn, this creature explores. Then you may have it become a copy of another creature you control until end of turn."
Irma, Part-Time Mutant74%
$4.61↑#3753↑0.00↓0.5 years↓
"At the beginning of combat on your turn, this card becomes a copy of up to one other target creature you control, except her name is this card and she has this ability. Then put a +1/+1 counter on her."
Cemetery Puca72%
$2.77↑#19602↓0.25↓18.3 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."
Cytoshape72%
$0.49↑#26270↓0.37↓20.3 years↑
"Choose a nonlegendary creature on the battlefield. Target creature becomes a copy of that creature until end of turn."
Mirror of the Forebears70%
$1.63↑#103600.53↓9.0 years↓
": Until end of turn, this artifact becomes a copy of target creature you control of the chosen type, except it's an artifact in addition to its other types."
: Until end of turn, this artifact becomes a copy of target creature you control of the chosen type, except it's an artifact in addition to its other types."
Write into Being70%
$0.19↓#20220↓0.00↓11.6 years↑
"Look at the top two cards of your library. Manifest one of those cards, then put the other on the top or bottom of your library."
Cephalid Facetaker70%
$5.46↑#6836↑0.33↓4.4 years↓
"At the beginning of combat on your turn, you may have this creature become a copy of another target creature until end of turn, except it's 1/4 and has "This creature can't be blocked.""
Artisan of Forms70%
$0.23↓#16795↓0.36↓12.9 years↑
"Whenever you cast a spell that targets this creature, you may have this creature become a copy of target creature, except it has this ability."
Gogo, Mysterious Mime70%
$1.51↑#2653↑0.37↓1.2 years↓
"At the beginning of combat on your turn, you may have this card become a copy of another target creature you control until end of turn, except its name is this card. If you do, this card and that creature each get +2/+0 and gain haste until end of turn and attack this turn if able."
Kimahri, Valiant Guardian70%
$0.25↓#7041↑0.28↓1.2 years↓
"At the beginning of combat on your turn, put a +1/+1 counter on this card and tap target creature an opponent controls. Then you may have this card become a copy of that creature, except its name is this card and it has vigilance and this ability."