Martial Impetus 

Enchantment — Aura
Enchant creature
Enchanted creature gets +1/+1 and is goaded. (It attacks each combat if able and attacks a player other than you if able.)
Whenever enchanted creature attacks, each other creature that's attacking one of your opponents gets +1/+1 until end of turn.
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Cards that do something similar expected a card that isn't here?
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Coercive Impetus 100%
$0.33#8401
"Enchanted creature gets +1/+1 and is goaded."
+1 more matching line
Acquired Mutation 87%
$0.32#9754
"Enchanted creature gets +2/+2 and is goaded."
+1 more matching line
Márton Stromgald 83%
#15594
"Whenever this card attacks, other attacking creatures get +1/+1 until end of turn for each attacking creature other than this card."
Wingnut, Bat on the Belfry 83%
$0.16#22585
"Whenever this card attacks, each other attacking creature gets +1/+0 until end of turn."
Renegade Warlord 81%
#30962
"Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn."
Jelenn Sphinx 81%
$0.08#23761
"Whenever this creature attacks, other attacking creatures get +1/+1 until end of turn."
Honored Crop-Captain 81%
$0.12#14586
"Whenever this creature attacks, other attacking creatures get +1/+0 until end of turn."
Firebird, Blazing Ranger 80%
$0.34#18766
"Whenever this card attacks, other attacking creatures get +X/+0 until end of turn, where X is this card's power."
Consul's Lieutenant 80%
$0.18#21483
"Whenever this creature attacks, if it's renowned, other attacking creatures you control get +1/+1 until end of turn."
Rampaging Classmate 80%
$0.27#25040
"Whenever this creature attacks, it gets +1/+0 until end of turn for each other attacking creature."