Merrow Levitator 

Creature — Merfolk Wizard
{T}: Target creature gains flying until end of turn.
Whenever you cast a blue spell, you may untap this creature.
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Cards that do something similar expected a card that isn't here?
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Leonin Battlemage 92%
$0.21#25413
"Whenever you cast a spell, you may untap this creature."
+1 more matching line
Pristine Skywise 88%
$0.22#22121
"Whenever you cast a noncreature spell, untap this creature. It gains protection from the color of your choice until end of turn."
Endbringer 87%
$0.36#2334
"Untap this creature during each other player's untap step."
+1 more matching line
Thousand Moons Infantry 87%
$0.12#22155
"Untap this creature during each other player's untap step."
Kindlespark Duo 87%
$0.19#5516
"Whenever you cast a noncreature spell, untap this creature."
+1 more matching line
Sand Squid 86%
$0.61#25209
"You may choose not to untap this creature during your untap step."
+1 more matching line
Preacher 86%
#22058
"You may choose not to untap this creature during your untap step."
+1 more matching line
Whip Vine 86%
$0.12#27095
"You may choose not to untap this creature during your untap step."
+1 more matching line
Phyrexian Gremlins 86%
$1.03#29985
"You may choose not to untap this creature during your untap step."
+1 more matching line
Ghosthelm Courier 86%
$0.20#28584
"You may choose not to untap this creature during your untap step."
Callous Oppressor 86%
$1.72#15408
"You may choose not to untap this creature during your untap step."