Frontier Warmonger 

Creature — Human Warrior
$0.25 #3163 0.07 6.4 years
Whenever one or more creatures attack one of your opponents or a planeswalker they control, those creatures gain menace until end of turn.
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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.
Frenzied Gorespawn90%
$2.07↑#12573↓0.58↑2.5 years↓
"Whenever one or more creatures attack one of your opponents, those creatures gain menace until end of turn."
Gahiji, Honored One87%
$0.38↑#11716↓0.0612.8 years↑
"Whenever a creature attacks one of your opponents or a planeswalker an opponent controls, that creature gets +2/+0 until end of turn."
Triarch Stalker86%
$0.38↑#14701↓0.20↑3.9 years↓
"Creatures attacking the last chosen player have menace."
Frenzied Saddlebrute80%
$0.16↓#8036↓0.36↑5.8 years
"All creatures can attack your opponents and planeswalkers your opponents control as though those creatures had haste."
Roar of Resistance76%
$1.96↑#6001↓0.133.6 years↓
"Whenever one or more creatures attack, you may pay 
. If you do, creatures attacking your opponents and/or planeswalkers they control get +2/+0 until end of turn."
Battlesong Berserker74%
$0.17↓#20681↓0.071.8 years↓
"Whenever you attack, target creature you control gets +1/+0 and gains menace until end of turn."
Gruul War Chant74%
$0.20↓#6642↓0.45↑13.3 years↑
"Attacking creatures you control get +1/+0 and have menace."
Inquisitorial Rosette72%
$2.78↑#6900↓0.55↑3.9 years↓
"Whenever equipped creature attacks, create a 2/2 white Astartes Warrior creature token with vigilance that's attacking. Then attacking creatures gain menace until end of turn."
Vow of Torment72%
$0.30↑#9270↓0.075.8 years
"Enchanted creature gets +2/+2, has menace, and can't attack you or planeswalkers you control."