Thousand-Year Elixir 
Artifact
You may activate abilities of creatures you control as though those creatures had haste.
{1}, {T}: Untap target creature.
click a line to search just that ability, click more to combine them
Cards that do something similar expected a card that isn't here?
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Tyvar, Jubilant Brawler 100%
$1.88#2385
"You may activate abilities of creatures you control as though those creatures had haste."
+1 more matching line
Shang-Chi, Master of Kung Fu 100%
$12.44#11012
"You may activate abilities of creatures you control as though those creatures had haste."
Magewright's Stone 95%
$9.77#2879
"{1}, {T}: Untap target creature that has an activated ability with {T} in its cost."
Dynaheir, Invoker Adept 88%
$0.18#13176
"You may activate abilities of other creatures you control as though those creatures had haste."
Fifty Feet of Rope 87%
$0.17#15744
"{3}, {T}: Target creature doesn't untap during its controller's next untap step."
The Moment 87%
$0.31#13667
"{2}, {T}: Untap target creature you control. It phases out until this card leaves the battlefield."
Saryth, the Viper's Fang 84%
$4.24#1226
"{1}, {T}: Untap another target creature or land you control."
Ebony Horse 81%
#24231
"{2}, {T}: Untap target attacking creature you control. Prevent all combat damage that would be dealt to and dealt by that creature this turn."
Ith, High Arcanist 81%
$0.22#19783
"{T}: Untap target attacking creature. Prevent all combat damage that would be dealt to and dealt by that creature this turn."