Jangling Automaton {3}
Artifact Creature — Construct
Whenever this creature attacks, untap all creatures defending player controls.
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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.
Copperhorn Scout 99%
$0.27#5520
"Whenever this creature attacks, untap each other creature you control."
Shakedown Heavy 96%
$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 96%
$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 94%
$0.28#25240
"Whenever this creature attacks, it doesn't untap during its controller's next untap step."
Lead Golem 94%
$0.13#31565
"Whenever this creature attacks, it doesn't untap during its controller's next untap step."
Melee 93%
$0.33#28941
"Whenever a creature attacks and isn't blocked this combat, untap it and remove it from combat."
Spectral Bears 92%
#19485
"Whenever this creature attacks, if defending player controls no black nontoken permanents, it doesn't untap during your next untap step."
Spectral Force 92%
$0.25#27516
"Whenever this creature attacks, if defending player controls no black permanents, it doesn't untap during your next untap step."
Finest Hour 90%
$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."
Triceraton Regenta 90%
$0.23#30604
"Whenever this creature attacks, untap up to one other target creature."
Raggadragga, Goreguts Boss 90%
$0.22#7103
"Whenever a creature you control with a mana ability attacks, untap it."
Tenth District Veteran 89%
$0.09#24951
"Whenever this creature attacks, untap another target creature you control."
Port Razer 89%
$0.98#1897
"Whenever this creature deals combat damage to a player, untap each creature you control. After this phase, there is an additional combat phase."
Reveille Squad 88%
$0.28#17354
"Whenever one or more creatures attack you, if this creature is untapped, you may untap all creatures you control."
Fear of Missing Out 88%
$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."
Bloodthirster 87%
$32.32#2531
"Whenever this creature deals combat damage to a player, untap it. After this phase, there is an additional combat phase."
Karlach, Fury of Avernus 87%
$25.13#1039
"Whenever you attack, if it's the first combat phase of the turn, untap all attacking creatures. They gain first strike until end of turn. After this phase, there is an additional combat phase."