Thunderous Might 

Enchantment — Aura
$0.25 #18627 0.06 12.7 years
Enchant creature
Whenever enchanted creature attacks, it gets +X/+0 until end of turn, where X is your devotion to red. (Each
in the mana costs of permanents you control counts toward your devotion to red.)
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Cards similar to Thunderous Might 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.
Fervent Charge80%
$0.73↑#5344↑0.0725.4 years↑
"Whenever a creature you control attacks, it gets +2/+2 until end of turn."
Glory Bearers80%
$0.03↓#26273↓0.006.7 years↓
"Whenever another creature you control attacks, it gets +0/+1 until end of turn."
Agrus Kos, Wojek Veteran79%
$0.36↑#182710.0621.0 years↑
"Whenever this card attacks, attacking red creatures get +2/+0 and attacking white creatures get +0/+2 until end of turn."
Mudbrawler Cohort79%
$0.14↓#27330↓0.0018.5 years↑
"This creature gets +1/+1 as long as you control another red creature."
Seasoned Consultant75%
$0.03↓#28462↓0.002.7 years↓
"Whenever you attack with three or more creatures, this creature gets +2/+0 until end of turn."
Heartlash Cinder75%
$0.14↓#26652↓0.0618.2 years↑
"When this creature enters, it gets +X/+0 until end of turn, where X is the number of red mana symbols in the mana costs of permanents you control."
Marshal of the Lost72%
$0.20↓#12488↑0.121.5 years↓
"Whenever you attack, target creature gets +X/+X until end of turn, where X is the number of attacking creatures."
Tori D'Avenant, Fury Rider72%
$0.24↓#6306↑0.114.1 years↓
"Whenever this card attacks, all other attacking creatures you control get +1/+1 until end of turn. Other red attacking creatures you control gain trample until end of turn. Untap each other white attacking creature you control."
Foundry Street Denizen72%
$0.19↓#10581↑0.0013.7 years↑
"Whenever another red creature you control enters, this creature gets +1/+0 until end of turn."
Dorothea, Vengeful Victim // Dorothea's Retribution71%
$0.28↑#155460.17↑4.9 years↓
"Enchant creature"
Clout of the Dominus70%
$1.90↑#6980↑0.40↑18.2 years↑
"As long as enchanted creature is red, it gets +1/+1 and has haste."
Scourge of the Nobilis70%
$0.14↓#187210.0018.2 years↑
"As long as enchanted creature is red, it gets +1/+1 and has "
: This creature gets +1/+0 until end of turn.""