Cairn Wanderer {4}{B}
Creature — Shapeshifter
Changeling (This card is every creature type.)
As long as a creature card with flying is in a graveyard, this creature has flying. The same is true for fear, first strike, double strike, deathtouch, haste, landwalk, lifelink, protection, reach, trample, shroud, and vigilance.
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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.
Death-Mask Duplicant 96%
$0.26#28357
"As long as a card exiled with this creature has flying, this creature has flying. The same is true for fear, first strike, double strike, haste, landwalk, protection, and trample."
Animus of Predation 93%
$0.08#31519
"If you removed a creature card with flying from the draft with cards named this card, this creature has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, and vigilance."
Soulflayer 90%
$0.34#20150
"If a creature card with flying was exiled with this creature's delve ability, this creature has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, reach, trample, and vigilance."
Urborg Scavengers 89%
$0.30#12363
"This creature has flying as long as a card exiled with it has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance."
Altar of the Wretched // Wretched Bonemass 87%
$1.39#7467
"This creature has flying as long as an exiled card used to craft it has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, protection, reach, trample, and vigilance."
Escaped Shapeshifter 87%
$1.09#29308
"As long as an opponent controls a creature with flying not named this card, this creature has flying. The same is true for first strike, trample, and protection from any color."
Rayami, First of the Fallen 87%
#21210
"As long as an exiled creature card with a blood counter on it has flying, this card has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, protection, reach, trample, and vigilance."
Eater of Virtue 85%
$0.38#9056
"As long as a card exiled with this card has flying, equipped creature has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, protection, reach, trample, and vigilance."
Thunderous Orator 84%
$0.21#19631
"Whenever this creature attacks, it gains flying until end of turn if you control a creature with flying. The same is true for first strike, double strike, deathtouch, indestructible, lifelink, menace, and trample."
Gravity Well 80%
$0.52#13521
"Whenever a creature with flying attacks, it loses flying until end of turn."