Voltaic Servant 
Artifact Creature — Construct
$0.22 #10321 0.20 8.4 years
At the beginning of your end step, untap target artifact.
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Cards similar to Voltaic Servant expected a card that isn't here?
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Corridor Monitor88%
$0.12↓#89790.43↑6.9 years↓
"When this creature enters, untap target artifact or creature you control."
Unwinding Clock85%
$19.49↑#548↑1.18↑15.3 years↑
"Untap all artifacts you control during each other player's untap step."
Cat-Owl84%
$0.16↓#18616↓0.00↓0.8 years↓
"Whenever this creature attacks, untap target artifact or creature."
Dross Scorpion82%
$0.31↑#104940.50↑22.9 years↑
"Whenever this creature or another artifact creature dies, you may untap target artifact."
Clock of Omens82%
$4.49↑#1725↑0.81↑22.3 years↑
"Tap two untapped artifacts you control: Untap target artifact."
Mobile Garrison80%
$0.31↑#106620.37↑9.6 years↑
"Whenever this Vehicle attacks, untap another target artifact or creature you control."
Hyperion Blacksmith77%
$2.15↑#31613↓0.2632.3 years↑
"
: You may tap or untap target artifact an opponent controls."
Living Brain, Mechanical Marvel76%
$0.21↓#16118↓0.38↑1.0 years↓
"At the beginning of combat on your turn, target non-Equipment artifact you control becomes an artifact creature with base power and toughness 3/3 until end of turn. Untap it."
Mirran Spy74%
$0.20↓#87030.3015.6 years↑
"Whenever you cast an artifact spell, you may untap target creature."