Golden-Tail Trainer {1}{G}{W}
Creature — Fox Samurai
Aura and Equipment spells you cast cost {X} 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 that do something similar expected a card that isn't here?
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Wild Beastmaster 91%
$0.35#8287
"Whenever this creature attacks, each other creature you control gets +X/+X until end of turn, where X is this creature's power."
Consul's Lieutenant 91%
$0.18#21483
"Whenever this creature attacks, if it's renowned, other attacking creatures you control get +1/+1 until end of turn."
Bolt Hound 90%
$0.14#13083
"Whenever this creature attacks, other creatures you control get +1/+0 until end of turn."
+1 more matching line
Soltari Champion 90%
#17048
"Whenever this creature attacks, other creatures you control get +1/+1 until end of turn."
Cultivator of Blades 87%
$0.34#9625
"Whenever this creature attacks, you may have other attacking creatures get +X/+X until end of turn, where X is this creature's power."
Jelenn Sphinx 87%
$0.08#23761
"Whenever this creature attacks, other attacking creatures get +1/+1 until end of turn."
Renegade Warlord 87%
#30962
"Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn."
Honored Crop-Captain 87%
$0.12#14586
"Whenever this creature attacks, other attacking creatures get +1/+0 until end of turn."
Dauntless Veteran 87%
$0.13#16001
"Whenever this creature attacks, creatures you control get +1/+1 until end of turn."
Inspiring Unicorn 87%
$0.18#15870
"Whenever this creature attacks, creatures you control get +1/+1 until end of turn."
Wandering Musicians 87%
$0.08#20535
"Whenever this creature attacks, creatures you control get +1/+0 until end of turn."
Demolisher Spawn 86%
$0.31#5994
"Whenever this creature attacks, if there are four or more card types among cards in your graveyard, other attacking creatures get +4/+4 until end of turn."
Incisor Glider 86%
$0.13#19290
"Whenever this creature attacks, if an opponent has three or more poison counters, creatures you control get +1/+1 until end of turn."
Akroan Hoplite 85%
$0.07#15923
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the number of attacking creatures you control."
Rampaging Classmate 84%
$0.27#25040
"Whenever this creature attacks, it gets +1/+0 until end of turn for each other attacking creature."
Bag End Porter 84%
$0.10#21791
"Whenever this creature attacks, it gets +X/+X until end of turn, where X is the number of legendary creatures you control."
Alpine Houndmaster 84%
$0.16#22386
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the number of other attacking creatures."