Nanoform Sentinel 
Artifact Creature — Robot
$0.16 #12168 0.00 1.2 years
Whenever this creature becomes tapped, untap another target permanent. This ability triggers only once each turn.
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Cards similar to Nanoform Sentinel expected a card that isn't here?
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Cacophodon84%
$0.21↑#109020.18↑8.8 years↑
"Whenever this creature is dealt damage, untap target permanent."
Captain America, Living Legend84%
$0.30↑#6898↑0.29↑0.3 years
"Whenever a creature you control becomes tapped during your turn, if it's the first time that creature has become tapped this turn, untap it."
Kiora's Follower81%
$0.31↑#1610↑0.33↑12.7 years↑
"
: Untap another target permanent."
: Untap another target permanent."
Volition Reins80%
$0.18↑#22092↓0.71↑16.1 years↑
"When this Aura enters, if enchanted permanent is tapped, untap it."
Vizier of Tumbling Sands80%
$0.20↑#3434↑0.22↑9.5 years↑
"When you cycle this card, untap target permanent."
Amulet of Vigor79%
$50.16↑#1273↑0.78↑16.7 years↑
"Whenever a permanent you control enters tapped, untap it."
Nimbleclaw Adept78%
$0.18↑#9164↑0.22↑4.4 years↑
": Untap two other target permanents. Activate only as a sorcery and only once each turn."
: Untap two other target permanents. Activate only as a sorcery and only once each turn."
Unbender Tine77%
$0.25↑#16319↓0.0617.5 years↑
": Untap another target permanent."
: Untap another target permanent."
Ioreth of the Healing House77%
$0.36↑#2420↑0.34↑3.3 years↑
": Untap another target permanent."
: Untap another target permanent."
Clever Conjurer76%
$0.21↑#9719↑0.055.2 years↑
": Untap target permanent not named this card. Activate only as a sorcery."
: Untap target permanent not named this card. Activate only as a sorcery."
Burst of Energy76%
$0.18↑#18695↓0.0627.7 years↑
"Untap target permanent."
Seedborn Muse75%
$16.09↑#286↑1.80↑23.7 years↑
"Untap all permanents you control during each other player's untap step."
Coral Trickster74%
$0.07↓#22865↓0.18↑20.0 years↑
"When this creature is turned face up, you may tap or untap target permanent."
Tidal Force74%
$0.48↑#17017↓0.18↑13.0 years↑
"At the beginning of each upkeep, you may tap or untap target permanent."
Radha, Coalition Warlord72%
$0.08↓#19074↓0.064.1 years↑
"Whenever this card becomes tapped, another target creature you control gets +X/+X until end of turn, where X is the number of basic land types among lands you control."
Merfolk Skyscout72%
$0.11↓#24285↓0.0016.5 years↑
"Whenever this creature attacks or blocks, untap target permanent."
Forensic Researcher72%
$0.29↑#8194↑0.27↑2.7 years↑
": Untap another target permanent you control."
: Untap another target permanent you control."
Lapis Lazuli Talisman72%
$0.96↑#25875↓0.0031.4 years↑
"Whenever a player casts a blue spell, you may pay 
. If you do, untap target permanent."
. If you do, untap target permanent."
Tidewater Minion71%
$0.19↑#20463↓0.11↑21.0 years↑
": Untap target permanent."
: Untap target permanent."
Veteran of the Depths70%
$0.20↑#25344↓0.0519.0 years↑
"Whenever this creature becomes tapped, you may put a +1/+1 counter on it."