Concerted Effort 
Enchantment
$1.46 #12733 0.16 20.9 years
At the beginning of each upkeep, creatures you control gain flying until end of turn if a creature you control has flying. The same is true for fear, first strike, double strike, landwalk, protection, trample, and vigilance.
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Cards similar to Concerted Effort 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 Duplicant84%
$0.22↓#28569↓0.0922.6 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."
Eater of Virtue81%
$0.35↓#9234↑0.05↓4.5 years↓
"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."
Bleeding Effect80%
$0.30↓#9340↑0.38↑2.2 years↓
"At the beginning of combat on your turn, creatures you control gain flying until end of turn if a creature card in your graveyard has flying. The same is true for first strike, double strike, deathtouch, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance."
Odric, Lunarch Marshal78%
$0.53↓#1492↑0.35↑10.4 years↓
"At the beginning of each combat, creatures you control gain first strike until end of turn if a creature you control has first strike. The same is true for flying, deathtouch, double strike, haste, hexproof, indestructible, lifelink, menace, reach, skulk, trample, and vigilance."
Akroma, Vision of Ixidor78%
$10.75↑#5159↑0.205.8 years↓
"At the beginning of each combat, until end of turn, each other creature you control gets +1/+1 if it has flying, +1/+1 if it has first strike, and so on for double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, protection, reach, trample, vigilance, and partner."
Cairn Wanderer74%
$0.35↓#115860.32↑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."
Akroma's Memorial72%
$35.89↑#1215↑0.91↑19.3 years↓
"Creatures you control have flying, first strike, vigilance, trample, haste, and protection from black and from red."
Majestic Myriarch70%
$0.36↓#146870.259.1 years↓
"At the beginning of each combat, this creature gains flying until end of turn if you control a creature with flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance."
Kathril, Aspect Warper70%
$0.48↓#147280.186.4 years↓
"When this card enters, put a flying counter on any creature you control if a creature card in your graveyard has flying. Repeat this process for first strike, double strike, deathtouch, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance. Then put a +1/+1 counter on this card for each counter put on a creature this way."
Altar of the Wretched // Wretched Bonemass70%
$1.45↓#7498↑0.65↑2.8 years↓
"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."