Meekstone

Creatures with power 3 or greater don't untap during their controllers' untap steps.

Imposing Sovereign

Creatures your opponents control enter tapped.

Tap target creature.
Metalcraft — If you control three or more artifacts, exile that creature.

Lands don't untap during their controllers' untap steps.
At the beginning of each player's upkeep, that player untaps a land they control.

Creatures entering don't cause abilities to trigger.