Militia Rallier 

Creature — Human Soldier
This creature can't attack alone.
Whenever this creature attacks, untap target creature.
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Cards that do something similar expected a card that isn't here?
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Tenth District Veteran 96%
$0.09#24951
"Whenever this creature attacks, untap another target creature you control."
Triceraton Regenta 94%
$0.23#30604
"Whenever this creature attacks, untap up to one other target creature."
Fear of Missing Out 94%
$2.37#2544
"Whenever this creature attacks for the first time each turn, if there are four or more card types among cards in your graveyard, untap target creature. After this phase, there is an additional combat phase."
Bloodcrazed Goblin 91%
$0.18#25197
"This creature can't attack unless an opponent has been dealt damage this turn."
Goblin Cohort 91%
$0.24#24308
"This creature can't attack unless you've cast a creature spell this turn."
Mogg Conscripts 91%
#27105
"This creature can't attack unless you've cast a creature spell this turn."
Orcish Conscripts 89%
#30294
"This creature can't attack unless at least two other creatures attack."
Silburlind Snapper 89%
$0.04#26997
"This creature can't attack unless you've cast a noncreature spell this turn."
Mogg Toady 88%
$0.11#30572
"This creature can't attack unless you control more creatures than defending player."
Goblin Goon 88%
$0.35#20282
"This creature can't attack unless you control more creatures than defending player."
Harbor Serpent 88%
$0.14#20206
"This creature can't attack unless there are five or more Islands on the battlefield."