Landroval, Horizon Witness 
Legendary Creature — Bird Noble
$0.19 #13812 0.27 3.3 years
Flying
Whenever two or more creatures you control attack a player, target attacking creature without flying gains flying until end of turn.
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Cards similar to Landroval, Horizon Witness 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.
Phyrexian Pegasus96%
$0.17↓#17555↓0.00↓3.5 years
"Whenever this creature attacks, another target attacking creature without flying 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↓#17601↓0.00↓7.5 years↑
"Whenever this creature attacks, target attacking creature without flying gains flying until end of turn."
Appa, Aang's Companion95%
$0.27↑#16654↓0.12↓0.9 years↓
"Whenever this card attacks, another target attacking creature without flying gains flying until end of turn."
+1 more matching line
Blessed Hippogriff // Tyr's Blessing93%
$0.16↓#135030.00↓4.4 years↑
"Whenever this creature attacks, target attacking creature without flying gains flying until end of turn."
Oteclan Landmark // Oteclan Levitator92%
$0.16↓#16955↓0.38↑2.9 years
"Whenever this creature attacks, target attacking creature without flying gains flying until end of turn."
Pegasus Courser92%
$0.11↓#17678↓0.308.5 years↑
"Whenever this creature attacks, another target attacking creature gains flying until end of turn."
Aerial Guide92%
$0.06↓#23552↓0.00↓9.3 years↑
"Whenever this creature attacks, another target attacking creature gains flying until end of turn."
Heavenly Qilin92%
$0.13↓#30037↓0.06↓8.3 years↑
"Whenever this creature attacks, another target creature you control gains flying until end of turn."
Trained Condor92%
$0.05↓#28912↓0.00↓13.3 years↑
"Whenever this creature attacks, another target creature you control gains flying until end of turn."
Chasm Drake92%
$0.08↓#30609↓0.2915.3 years↑
"Whenever this creature attacks, target creature you control gains flying until end of turn."
Gryffwing Cavalry92%
$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."
Kinsbaile Balloonist91%
$0.14↓#26585↓0.00↓19.0 years↑
"Whenever this creature attacks, you may have target creature gain flying until end of turn."
Gwaihir, Greatest of the Eagles90%
$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
Starry-Eyed Skyrider88%
$0.15↓#8250↑0.11↓1.5 years↓
"Whenever this creature attacks, another target creature you control gains flying until end of turn."
Helitrooper84%
$0.21↑#7766↑0.12↓1.4 years↓
"Whenever this creature attacks, another target attacking creature gains flying until end of turn."
Gravity Negator84%
$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."
Seedpod Squire84%
$0.09↓#21204↓0.00↓2.2 years↓
"Whenever this creature attacks, target creature you control without flying gets +1/+1 until end of turn."
Eddytrail Hawk82%
$0.06↓#20449↓0.00↓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."
Encouraging Aviator // Jump82%
$0.23↑#160700.05↓0.5 years↓
"Target creature gains flying until end of turn."