Unwinding Clock 
Artifact
Untap all artifacts you control during each other player's untap step.
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?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Ashnod's Battle Gear 91%
$0.20#30335
"You may choose not to untap this artifact during your untap step."
Vedalken Shackles 91%
$7.66#11447
"You may choose not to untap this artifact during your untap step."
Deserter's Quarters 91%
$0.05#29280
"You may choose not to untap this artifact during your untap step."
Helm of Possession 91%
$5.07#14749
"You may choose not to untap this artifact during your untap step."
Ohabi Caleria 89%
$0.24#17794
"Untap all Archers you control during each other player's untap step."
Summoning Station 89%
$7.60#11827
"Whenever an artifact is put into a graveyard from the battlefield, you may untap this artifact."