Escaped Shapeshifter 
Creature — Shapeshifter
$1.01 #29392 0.06 28.9 years
As long as an opponent controls a creature with flying not named Escaped Shapeshifter, this creature has flying. The same is true for first strike, trample, and protection from any color.
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Cards similar to Escaped Shapeshifter 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 Duplicant74%
$0.22↓#285690.0922.6 years↓
"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."
Cairn Wanderer72%
$0.35↓#11586↑0.32↑18.9 years↓
"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."
Rayami, First of the Fallen70%
$0.27↓#21582↑0.38↑7.0 years↓
"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."