Aradesh, the Founder {2}{W}
Legendary Creature — Human Soldier
Enlist (As this creature attacks, you may tap a nonattacking creature you control without summoning sickness. When you do, add its power to this creature's until end of turn.)
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.
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Cards that do something similar expected a card that isn't here?
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Rafiq of the Many 95%
$0.29#10463
"Whenever a creature you control attacks alone, it gains double strike until end of turn."
Seifer Almasy 95%
$0.23#10671
"Whenever a creature you control attacks alone, it gains double strike until end of turn."
Squall, SeeD Mercenary 95%
$0.78#3820
"Whenever a creature you control attacks alone, it gains double strike until end of turn."
Reyav, Master Smith 91%
$0.25#2917
"Whenever a creature you control that's enchanted or equipped attacks, that creature gains double strike until end of turn."
Picnic Ruiner // Stolen Goodies 89%
$0.15#14988
"Whenever this creature attacks while you control a creature with power 4 or greater, this creature gains double strike until end of turn."
Momentum Rumbler 86%
$0.26#21905
"Whenever this creature attacks, if it has first strike, it gains double strike until end of turn."
Flaming Fist 86%
$0.19#4909
"Commander creatures you own have "Whenever this creature attacks, it gains double strike until end of turn.""
Atarka, World Render 86%
$0.36#1313
"Whenever a Dragon you control attacks, it gains double strike until end of turn."
Master Symmetrist 85%
$0.13#21708
"Whenever a creature you control with power equal to its toughness attacks, it gains trample until end of turn."
Ekundu Cyclops 83%
$0.11#30718
"If a creature you control attacks, this creature also attacks if able."
Death Kiss 83%
$4.35#4477
"Whenever a creature an opponent controls attacks one of your opponents, double its power until end of turn."
Senu, Keen-Eyed Protector 82%
$0.83#4327
"When a legendary creature you control attacks and isn't blocked, if this card is exiled, put it onto the battlefield attacking."
Goring Ceratops 82%
$0.73#6309
"Whenever this creature attacks, other creatures you control gain double strike until end of turn."
War Machine, Avenging Arsenal 81%
$0.88#15123
"Whenever this card attacks, attacking modified creatures you control gain double strike until end of turn."
Tanazir Quandrix 81%
$0.25#8639
"Whenever this card attacks, you may have the base power and toughness of other creatures you control become equal to this card's power and toughness until end of turn."
Battlegrace Angel 81%
$1.22#12401
"Whenever a creature you control attacks alone, it gains lifelink until end of turn."
Imperious Mindbreaker 81%
$0.37#14266
"As long as this card is paired with another creature, each of those creatures has "Whenever this creature attacks, each opponent mills cards equal to its toughness.""
Redoubled Stormsinger 81%
$0.25#3402
"Whenever this creature attacks, for each creature token you control that entered this turn, create a tapped and attacking token that's a copy of that token. At the beginning of the next end step, sacrifice those tokens."
Tahngarth, First Mate 80%
$0.23#15357
"Whenever an opponent attacks with one or more creatures, if this card is tapped, you may have that opponent gain control of this card until end of combat. If you do, choose a player or planeswalker that opponent is attacking. this card is attacking that player or planeswalker."