Pegasus Courser 
Creature — Pegasus
$0.11 #17678 0.30 8.5 years
Flying
Whenever this creature attacks, another target attacking creature gains flying until end of turn.
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Cards similar to Pegasus Courser 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.
Aerial Guide100%
$0.06↓#23552↓0.00↓9.3 years
"Whenever this creature attacks, another target attacking creature gains flying until end of turn."
Kinsbaile Balloonist98%
$0.14↑#26585↓0.00↓19.0 years↑
"Whenever this creature attacks, you may have target creature gain flying until end of turn."
Heavenly Qilin98%
$0.13↑#30037↓0.06↓8.3 years
"Whenever this creature attacks, another target creature you control gains flying until end of turn."
Trained Condor98%
$0.05↓#28912↓0.00↓13.3 years↑
"Whenever this creature attacks, another target creature you control gains flying until end of turn."
Chasm Drake98%
$0.08↓#30609↓0.2915.3 years↑
"Whenever this creature attacks, target creature you control gains flying until end of turn."
Gwaihir, Greatest of the Eagles98%
$0.43↑#5954↑0.07↓3.3 years↓
"Whenever this card attacks, target attacking creature gains flying until end of turn."
+1 more matching line
Phyrexian Pegasus96%
$0.17↑#175550.00↓3.5 years↓
"Whenever this creature attacks, another target attacking creature without flying gains flying until end of turn."
Starry-Eyed Skyrider96%
$0.15↑#8250↑0.11↓1.5 years↓
"Whenever this creature attacks, another target creature you control gains flying until end of turn."
Roc Charger96%
$0.15↑#26875↓0.00↓8.0 years
"Whenever this creature attacks, target attacking creature without flying gains flying until end of turn."
Trusted Pegasus96%
$0.13↑#176010.00↓7.5 years↓
"Whenever this creature attacks, target attacking creature without flying gains flying until end of turn."
Helitrooper95%
$0.21↑#7766↑0.12↓1.4 years↓
"Whenever this creature attacks, another target attacking creature gains flying until end of turn."
Gravity Negator95%
$0.05↓#26180↓0.00↓10.7 years↑
"Whenever this creature attacks, you may pay 
. If you do, another target creature gains flying until end of turn."
. If you do, another target creature gains flying until end of turn."
Appa, Aang's Companion94%
$0.27↑#166540.12↓0.9 years↓
"Whenever this card attacks, another target attacking creature without flying gains flying until end of turn."
+1 more matching line
Eddytrail Hawk93%
$0.06↓#204490.00↓10.1 years↑
"Whenever this creature attacks, you may pay 
. If you do, another target attacking creature gains flying until end of turn."
. If you do, another target attacking creature gains flying until end of turn."
Gryffwing Cavalry93%
$0.09↓#25143↓0.00↓4.9 years↓
"Whenever this creature attacks, you may pay 
. If you do, target attacking creature without flying gains flying until end of turn."
. If you do, target attacking creature without flying gains flying until end of turn."
Blessed Hippogriff // Tyr's Blessing92%
$0.16↑#13503↑0.00↓4.4 years↓
"Whenever this creature attacks, target attacking creature without flying gains flying until end of turn."
Landroval, Horizon Witness92%
$0.19↑#13812↑0.273.3 years↓
"Whenever two or more creatures you control attack a player, target attacking creature without flying gains flying until end of turn."
Oteclan Landmark // Oteclan Levitator92%
$0.16↑#169550.382.9 years↓
"Whenever this creature attacks, target attacking creature without flying gains flying until end of turn."
Kitesail Skirmisher91%
$0.17↑#21563↓0.12↓5.9 years↓
"Whenever this creature attacks, another target creature attacking the same player or planeswalker gains flying until end of turn."
+1 more matching line
Storm, Queen of Wakanda90%
$0.33↑#150190.41↑0.3 years↓
"Whenever this card attacks, until end of turn, another target attacking creature gains flying and gets +X/+0, where X is this card's power."