Watcher of the Spheres 
Creature — Bird Wizard
$0.63 #4274 0.03 6.3 years
Flying
Creature spells with flying you cast cost 
less to cast.
less to cast.Whenever another creature you control with flying enters, this creature gets +1/+1 until end of turn.
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Cards similar to Watcher of the Spheres 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.
Warden of Evos Isle98%
$0.18↓#37790.0413.3 years↑
"Creature spells with flying you cast cost less to cast."
less to cast."
Waterkin Shaman96%
$0.10↓#31011↓0.007.3 years
"Whenever a creature you control with flying enters, this creature gets +1/+1 until end of turn."
Momo, Friendly Flier90%
$0.39↓#7102↓0.080.9 years↓
"Whenever another creature you control with flying enters, this card gets +1/+1 until end of turn."
+1 more matching line
Planar Gate88%
$74.69↑#21434↓0.38↑32.4 years↑
"Creature spells you cast cost 
less to cast."
less to cast."
Marauding Raptor86%
$0.85↑#3049↑0.19↑7.3 years
"Creature spells you cast cost less to cast."
less to cast."
The Sibsig Ceremony84%
$0.35↓#8842↓0.121.5 years↓
"Creature spells you cast cost less to cast."
less to cast."
Winged Words82%
$0.19↓#35980.077.3 years
"This spell costs less to cast if you control a creature with flying."
less to cast if you control a creature with flying."
Honest Rutstein82%
$0.38↓#1855↑0.16↑2.5 years↓
"Creature spells you cast cost less to cast."
less to cast."
Griffin Protector82%
$0.09↓#21601↓0.0014.3 years↑
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
East Wind Avatar82%
$0.09↓#24614↓0.070.6 years↓
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Herd Gnarr80%
$0.09↓#31509↓0.0521.2 years↑
"Whenever another creature you control enters, this creature gets +2/+2 until end of turn."
Kapsho Kitefins80%
$0.26↓#20535↓0.33↑12.3 years↑
"Flying"
Attended Socialite80%
$0.13↓#23977↓0.004.5 years↓
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
Loporrit Scout80%
$0.12↓#18974↓0.001.4 years↓
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
Bronzebeak Moa80%
$0.05↓#25082↓0.0513.5 years↑
"Whenever another creature you control enters, this creature gets +3/+3 until end of turn."
Mutant Town Musicians80%
$0.07↓#25291↓0.21↑0.6 years↓
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Llanowar Stalker80%
$0.15↓#22852↓0.064.1 years↓
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Beast-Kin Ranger80%
$0.19↓#15328↓0.051.9 years↓
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Crossroads Watcher80%
$0.13↓#19487↓0.15↑0.7 years↓
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Plumecreed Mentor80%
$0.21↓#14301↓0.002.2 years↓
"Whenever this creature or another creature you control with flying enters, put a +1/+1 counter on target creature you control without flying."