Tenth District Veteran 

Creature — Human Soldier
Vigilance
Whenever this creature attacks, untap another target creature you control.
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Cards that do something similar 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.
Triceraton Regenta 97%
$0.23#30604
"Whenever this creature attacks, untap up to one other target creature."
+1 more matching line
Fear of Missing Out 95%
$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."
Copperhorn Scout 89%
$0.27#5520
"Whenever this creature attacks, untap each other creature you control."
Jangling Automaton 89%
$0.11#21680
"Whenever this creature attacks, untap all creatures defending player controls."
Melee 88%
$0.33#28941
"Whenever a creature attacks and isn't blocked this combat, untap it and remove it from combat."
Thistledown Players 88%
$0.07#11983
"Whenever this creature attacks, untap target nonland permanent."
Shakedown Heavy 87%
$0.35#6566
"Whenever this creature attacks, defending player may have you draw a card. If they do, untap this creature and remove it from combat."
Scourge of the Throne 86%
$0.39#1277
"Whenever this creature attacks for the first time each turn, if it's attacking the player with the most life or tied for most life, untap all attacking creatures. After this phase, there is an additional combat phase."
Apes of Rath 86%
$0.28#25240
"Whenever this creature attacks, it doesn't untap during its controller's next untap step."
Lead Golem 86%
$0.13#31565
"Whenever this creature attacks, it doesn't untap during its controller's next untap step."
Zephyr Winder 85%
$0.21#24640
"Whenever this creature deals combat damage to a player, untap up to one target creature."
Beacon Hawk 85%
$0.06#20347
"Whenever this creature deals combat damage to a player, you may untap target creature."
Finest Hour 83%
$1.17#8384
"Whenever a creature you control attacks alone, if it's the first combat phase of the turn, untap that creature. After this phase, there is an additional combat phase."
Spectral Bears 83%
#19485
"Whenever this creature attacks, if defending player controls no black nontoken permanents, it doesn't untap during your next untap step."
Spectral Force 83%
$0.25#27516
"Whenever this creature attacks, if defending player controls no black permanents, it doesn't untap during your next untap step."