War Machine, Avenging Arsenal 

Legendary Artifact Creature — Human Hero
$0.39 #11067 0.33 0.3 years
Flying
Whenever War Machine attacks, attacking modified creatures you control gain double strike until end of turn. (Equipment, Auras you control, and counters are modifications.)
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Cards similar to War Machine, Avenging Arsenal 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.
Chocobo Knights88%
$0.31↓#4184↑0.53↑1.4 years↑
"Whenever you attack, creatures you control with counters on them gain double strike until end of turn."
Goring Ceratops84%
$0.77↑#6487↑0.12↓9.1 years↑
"Whenever this creature attacks, other creatures you control gain double strike until end of turn."
Rafiq of the Many84%
$0.31↓#109820.2618.0 years↑
"Whenever a creature you control attacks alone, it gains double strike until end of turn."
Reyav, Master Smith83%
$0.28↓#2798↑0.23↓5.9 years↑
"Whenever a creature you control that's enchanted or equipped attacks, that creature gains double strike until end of turn."
Blade Historian82%
$4.85↑#2721↑0.46↑5.5 years↑
"Attacking creatures you control have double strike."
Dáin Ironfoot82%
$0.23↓#94760.09↓0.2 years
"Whenever Dáin attacks, each equipped attacking creature gains double strike until end of turn."
Atarka, World Render79%
$0.42↑#1374↑0.51↑11.7 years↑
"Whenever a Dragon you control attacks, it gains double strike until end of turn."
Ticket Booth // Tunnel of Hate78%
$0.12↓#110360.07↓2.1 years↑
"Whenever you attack, target attacking creature gains double strike until end of turn."
Squall, SeeD Mercenary78%
$1.58↑#3550↑0.20↓1.4 years↑
"Whenever a creature you control attacks alone, it gains double strike until end of turn."
Seifer Almasy76%
$0.28↓#104540.321.4 years↑
"Whenever a creature you control attacks alone, it gains double strike until end of turn."
Flaming Fist76%
$0.26↓#5141↑0.314.4 years↑
"Commander creatures you own have "Whenever this creature attacks, it gains double strike until end of turn.""
Silverblade Paladin76%
$0.61↑#100530.06↓14.5 years↑
"As long as this creature is paired with another creature, both creatures have double strike."
Silver Sable, Mercenary Leader75%
$0.26↓#110020.00↓1.1 years
"Whenever this card attacks, target modified creature you control gains lifelink until end of turn."
Expanding Ooze75%
$0.17↓#17534↓0.07↓2.3 years↑
"Whenever this creature attacks, put a +1/+1 counter on target modified creature you control."
Yuriko, Blade of the Mighty74%
$0.20↓#19294↓0.260.0 years
"Whenever a creature you control attacks a player alone, it gains double strike until end of turn."
Iron Man, Armored Avenger74%
$1.04↑#7355↑0.47↑0.3 years
"Whenever this card attacks, other attacking modified creatures gain flying until end of turn."
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