Corridor Monitor 

Artifact Creature — Construct
$0.10 #9079 0.15 7.0 years
When this creature enters, untap target artifact or creature you control.
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Cards similar to Corridor Monitor expected a card that isn't here?
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Voltaic Servant88%
$0.20↑#103610.04↓8.5 years↑
"At the beginning of your end step, untap target artifact."
Breaching Hippocamp85%
$0.06↓#14892↓0.1213.1 years↑
"When this creature enters, untap another target creature you control."
Cat-Owl84%
$0.12↑#18513↓0.200.9 years↓
"Whenever this creature attacks, untap target artifact or creature."
Mobile Garrison82%
$0.30↑#10922↓0.059.7 years↑
"Whenever this Vehicle attacks, untap another target artifact or creature you control."
Katara's Reversal81%
$1.83↑#11707↓0.63↑0.9 years↓
"Untap up to four target artifacts and/or creatures."
Unwinding Clock79%
$19.99↑#545↑1.36↑15.4 years↑
"Untap all artifacts you control during each other player's untap step."
Teferi, Timebender78%
$1.40↑#16975↓0.38↑8.5 years↑
"+2: Untap up to one target artifact or creature."
Mirran Spy78%
$0.28↑#87190.31↑15.7 years↑
"Whenever you cast an artifact spell, you may untap target creature."
Invoke the Winds76%
$0.27↑#11393↓0.33↑4.7 years↓
"Gain control of target artifact or creature. Untap it."
Guac & Marshmallow Pizza73%
$0.24↑#14823↓0.35↑0.6 years↓
"When this artifact enters, target creature gets +2/+2 until end of turn. Untap it."