Chameleon Spirit {3}{U}
Creature — Illusion Spirit
As this creature enters, choose a color.
Chameleon Spirit's power and toughness are each equal to the number of permanents of the chosen color your opponents control.
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Cards that do something similar 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.
Squawkroaster 92%
$0.09#25765
"this card's power is equal to the number of colors among permanents you control."
Crowd of Cinders 86%
$0.12#27408
"this card's power and toughness are each equal to the number of black permanents you control."
Faerie Swarm 86%
$1.07#17565
"this card's power and toughness are each equal to the number of blue permanents you control."
Regal Bunnicorn 85%
$0.70#6155
"this card's power and toughness are each equal to the number of nonland permanents you control."
Drove of Elves 82%
$0.59#14016
"this card's power and toughness are each equal to the number of green permanents you control."
Kithkin Rabble 81%
$0.33#20650
"this card's power and toughness are each equal to the number of white permanents you control."
Katilda, Dawnhart Martyr // Katilda's Rising Dawn 81%
$0.95#5784
"this card's power and toughness are each equal to the number of permanents you control that are Spirits and/or enchantments."
Umbra Stalker 81%
$0.43#26106
"this card's power and toughness are each equal to the number of black mana symbols in the mana costs of cards in your graveyard."
Abominable Treefolk 80%
$0.25#12172
"this card's power and toughness are each equal to the number of snow permanents you control."
Horde of Boggarts 80%
$0.33#19950
"this card's power and toughness are each equal to the number of red permanents you control."