War Machine, Avenging Arsenal {4}{R}
Legendary Artifact Creature — Human Hero
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 that do something similar expected a card that isn't here?
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Aradesh, the Founder 81%
$0.26#13302
"Whenever a creature you control attacks, if it enlisted a creature this combat, the creature that attacked gains double strike until end of turn. If that creature's power is 4 or greater, draw a card."
Rasaad yn Bashir 80%
$0.23#9696
"Whenever this card attacks, if you have the initiative, double the toughness of each creature you control until end of turn."
Squall, SeeD Mercenary 80%
$0.78#3820
"Whenever a creature you control attacks alone, it gains double strike until end of turn."
Rafiq of the Many 80%
$0.29#10463
"Whenever a creature you control attacks alone, it gains double strike until end of turn."
Seifer Almasy 80%
$0.23#10671
"Whenever a creature you control attacks alone, it gains double strike until end of turn."
Atarka, World Render 80%
$0.36#1313
"Whenever a Dragon you control attacks, it gains double strike until end of turn."