Jangling Automaton 
Artifact Creature — Construct
$0.10 #22130 0.06 29.2 years
Whenever this creature attacks, untap all creatures defending player controls.
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Cards similar to Jangling Automaton expected a card that isn't here?
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Tenth District Veteran92%
$0.08↓#252880.25↑7.6 years↓
"Whenever this creature attacks, untap another target creature you control."
Dauntless Aven92%
$0.22↑#207640.009.1 years↓
"Whenever this creature attacks, untap target creature you control."
Triceraton Regenta90%
$0.21↑#30289↓0.000.5 years↓
"Whenever this creature attacks, untap up to one other target creature."
Militia Rallier88%
$0.13↑#261260.47↑4.8 years↓
"Whenever this creature attacks, untap target creature."
Copperhorn Scout88%
$0.22↑#5570↑0.25↑15.9 years↓
"Whenever this creature attacks, untap each other creature you control."
Bazaar Krovod86%
$0.09↓#29301↓0.0013.9 years↓
"Whenever this creature attacks, another target attacking creature gets +0/+2 until end of turn. Untap that creature."
Lead Golem86%
$0.15↑#31843↓0.0029.9 years
"Whenever this creature attacks, it doesn't untap during its controller's next untap step."
Cat-Owl81%
$0.16↑#186160.000.8 years↓
"Whenever this creature attacks, untap target artifact or creature."
Aurelia, the Warleader80%
$3.07↑#822↑0.67↑13.6 years↓
"Whenever this card attacks for the first time each turn, untap all creatures you control. After this phase, there is an additional combat phase."
Hellkite Charger78%
$3.05↑#2144↑0.45↑16.9 years↓
"Whenever this creature attacks, you may pay 

. If you do, untap all attacking creatures and after this phase, there is an additional combat phase."
Raph & Leo, Sibling Rivals76%
$0.79↑#9035↑0.000.5 years↓
"Whenever this card attack, if it's the first combat phase of the turn, untap one or two target attacking creatures. After this phase, there is an additional combat phase."
Finest Hour76%
$0.81↑#8538↑0.40↑17.3 years↓
"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."
Civic Gardener74%
$0.18↑#194930.054.4 years↓
"Whenever this creature attacks, untap target creature or land."
Mobile Garrison74%
$0.31↑#10662↑0.37↑9.6 years↓
"Whenever this Vehicle attacks, untap another target artifact or creature you control."
Restless Ridgeline74%
$0.39↑#4609↑0.072.8 years↓
"Whenever this land attacks, another target attacking creature gets +2/+0 until end of turn. Untap that creature."
Sparring Regimen73%
$0.26↑#17335↑0.005.4 years↓
"Whenever you attack, put a +1/+1 counter on target attacking creature and untap it."
Zephyr Winder73%
$0.19↑#249230.25↑3.4 years↓
"Whenever this creature deals combat damage to a player, untap up to one target creature."
Scourge of the Throne72%
$0.46↑#1279↑0.40↑12.2 years↓
"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."