Golden-Tail Trainer 
Creature — Fox Samurai
$0.24 #10384 0.25 2.3 years
Aura and Equipment spells you cast cost 
less to cast, where X is this creature's power.
less to cast, where X is this creature's power.Whenever this creature attacks, other modified creatures you control get +X/+X until end of turn, where X is this creature's power. (Equipment, Auras you control, and counters are modifications.)
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Cards similar to Golden-Tail Trainer 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.
Danitha Capashen, Paragon90%
$0.34↑#804↑0.208.5 years↑
"Aura and Equipment spells you cast cost less to cast."
less to cast."
Wild Beastmaster82%
$0.23↓#86600.3514.0 years↑
"Whenever this creature attacks, each other creature you control gets +X/+X until end of turn, where X is this creature's power."
Firebird, Blazing Ranger78%
$0.21↓#15284↓0.15↓0.3 years↓
"Whenever this card attacks, other attacking creatures get +X/+0 until end of turn, where X is this card's power."
Cultivator of Blades78%
$0.33↑#100450.50↑10.1 years↑
"Whenever this creature attacks, you may have other attacking creatures get +X/+X until end of turn, where X is this creature's power."
Transcendent Envoy76%
$0.16↓#2887↑0.166.7 years↑
"Aura spells you cast cost less to cast."
less to cast."
Bureau Headmaster76%
$5.92↑#3646↑0.192.3 years
"Equipment spells you cast cost less to cast."
less to cast."
Bladegraft Aspirant76%
$0.27↑#7917↑0.05↓3.7 years↑
"Equipment spells you cast cost less to cast."
less to cast."
Tuya Bearclaw74%
$0.24#108070.43↑5.9 years↑
"Whenever this card attacks, it gets +X/+X until end of turn, where X is the greatest power among other creatures you control."
Rubblebelt Rioters73%
$0.24#18384↓0.13↓7.5 years↑
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the greatest power among creatures you control."
Gruul Beastmaster72%
$0.09↓#24910↓0.00↓7.7 years↑
"Whenever this creature attacks, another target creature you control gets +X/+0 until end of turn, where X is this creature's power."
Syr Alin, the Lion's Claw72%
$0.06↓#15208↓0.06↓7.0 years↑
"Whenever this card attacks, other creatures you control get +1/+1 until end of turn."
Dauntless Veteran72%
$0.18↓#16273↓0.00↓1.9 years
"Whenever this creature attacks, creatures you control get +1/+1 until end of turn."
Inspiring Unicorn72%
$0.13↓#16020↓0.178.0 years↑
"Whenever this creature attacks, creatures you control get +1/+1 until end of turn."
Syr Faren, the Hengehammer72%
$0.25↑#16530↓0.00↓7.0 years↑
"Whenever this card attacks, another target attacking creature gets +X/+X until end of turn, where X is this card's power."
Iron-Craw Crusher72%
$0.19↓#18757↓0.06↓3.9 years↑
"Whenever this creature attacks, target attacking creature gets +X/+0 until end of turn, where X is this creature's power."
Hero of Iroas71%
$0.62↑#7254↑0.13↓12.7 years↑
"Aura spells you cast cost less to cast."
less to cast."
Pianna, Nomad Captain70%
$0.21↓#22195↓0.00↓25.1 years↑
"Whenever this card attacks, attacking creatures get +1/+1 until end of turn."
Iroh, Firebending Instructor70%
$0.24#16180↓0.14↓0.9 years↓
"Whenever this card attacks, attacking creatures get +1/+1 until end of turn."
Wandering Musicians70%
$0.12↓#20719↓0.240.9 years↓
"Whenever this creature attacks, creatures you control get +1/+0 until end of turn."
Consul's Lieutenant70%
$0.10↓#22234↓0.14↓11.3 years↑
"Whenever this creature attacks, if it's renowned, other attacking creatures you control get +1/+1 until end of turn."