Ardeth, Medjai Guardian

Vigilance, Lifelink
Whenever Ardeth, Medjai Guardian
and at least two other creatures attack, you
may choose an artifact an opponent controls.
Those permanents don't untap during their
controller's next untap step.
This place is a sanctuary, and I am its keeper.
Those who seek to plunder its treasures will find
their greed comes at a cost.