Legendary creatures don't untap during their controllers' untap steps.
When this artifact enters, tap all legendary creatures.
Illustrated by Tom Wänerstrand · Masters Edition III · #188
There are no rulings for Arena of the Ancients.
, : Tap all other artifacts. They don't untap during their controllers' untap steps for as long as this artifact remains tapped.
Creatures with power 1 or less don't untap during their controllers' untap steps.
This creature doesn't untap during your untap step.
Whenever an artifact enters, you may untap this creature.
When this artifact enters, draw a card.
, Sacrifice this artifact: Target creature doesn't untap during its controller's next untap step.
Whenever a nontoken creature enters, if this artifact is untapped, that creature's controller creates a 1/1 colorless Myr artifact creature token.
Players can't untap more than one artifact during their untap steps.